[illumos-gate merge]

commit e914ace2e9d9bf2dbf9a1f1ce81cb776022096f5
    10343 ZoL: Prefix all refcount functions with zfs_

	Conflicts:
	usr/src/uts/common/fs/zfs/dmu_tx.c

27 files changed, 405 insertions, 386 deletions

diff --git a/usr/src/uts/common/fs/zfs/abd.c b/usr/src/uts/common/fs/zfs/abd.c
index 49e23bd43d..0dc61e4907 100644
--- a/usr/src/uts/common/fs/zfs/abd.c
+++ b/usr/src/uts/common/fs/zfs/abd.c
@@ -294,7 +294,7 @@ abd_alloc(size_t size, boolean_t is_metadata)
 	}
 	abd->abd_size = size;
 	abd->abd_parent = NULL;
-	refcount_create(&abd->abd_children);
+	zfs_refcount_create(&abd->abd_children);
 
 	abd->abd_u.abd_scatter.abd_offset = 0;
 	abd->abd_u.abd_scatter.abd_chunk_size = zfs_abd_chunk_size;
@@ -321,7 +321,7 @@ abd_free_scatter(abd_t *abd)
 		abd_free_chunk(abd->abd_u.abd_scatter.abd_chunks[i]);
 	}
 
-	refcount_destroy(&abd->abd_children);
+	zfs_refcount_destroy(&abd->abd_children);
 	ABDSTAT_BUMPDOWN(abdstat_scatter_cnt);
 	ABDSTAT_INCR(abdstat_scatter_data_size, -(int)abd->abd_size);
 	ABDSTAT_INCR(abdstat_scatter_chunk_waste,
@@ -348,7 +348,7 @@ abd_alloc_linear(size_t size, boolean_t is_metadata)
 	}
 	abd->abd_size = size;
 	abd->abd_parent = NULL;
-	refcount_create(&abd->abd_children);
+	zfs_refcount_create(&abd->abd_children);
 
 	if (is_metadata) {
 		abd->abd_u.abd_linear.abd_buf = zio_buf_alloc(size);
@@ -371,7 +371,7 @@ abd_free_linear(abd_t *abd)
 		zio_data_buf_free(abd->abd_u.abd_linear.abd_buf, abd->abd_size);
 	}
 
-	refcount_destroy(&abd->abd_children);
+	zfs_refcount_destroy(&abd->abd_children);
 	ABDSTAT_BUMPDOWN(abdstat_linear_cnt);
 	ABDSTAT_INCR(abdstat_linear_data_size, -(int)abd->abd_size);
 
@@ -477,8 +477,8 @@ abd_get_offset(abd_t *sabd, size_t off)
 
 	abd->abd_size = sabd->abd_size - off;
 	abd->abd_parent = sabd;
-	refcount_create(&abd->abd_children);
-	(void) refcount_add_many(&sabd->abd_children, abd->abd_size, abd);
+	zfs_refcount_create(&abd->abd_children);
+	(void) zfs_refcount_add_many(&sabd->abd_children, abd->abd_size, abd);
 
 	return (abd);
 }
@@ -502,7 +502,7 @@ abd_get_from_buf(void *buf, size_t size)
 	abd->abd_flags = ABD_FLAG_LINEAR;
 	abd->abd_size = size;
 	abd->abd_parent = NULL;
-	refcount_create(&abd->abd_children);
+	zfs_refcount_create(&abd->abd_children);
 
 	abd->abd_u.abd_linear.abd_buf = buf;
 
@@ -520,11 +520,11 @@ abd_put(abd_t *abd)
 	ASSERT(!(abd->abd_flags & ABD_FLAG_OWNER));
 
 	if (abd->abd_parent != NULL) {
-		(void) refcount_remove_many(&abd->abd_parent->abd_children,
+		(void) zfs_refcount_remove_many(&abd->abd_parent->abd_children,
 		    abd->abd_size, abd);
 	}
 
-	refcount_destroy(&abd->abd_children);
+	zfs_refcount_destroy(&abd->abd_children);
 	abd_free_struct(abd);
 }
 
@@ -556,7 +556,7 @@ abd_borrow_buf(abd_t *abd, size_t n)
 	} else {
 		buf = zio_buf_alloc(n);
 	}
-	(void) refcount_add_many(&abd->abd_children, n, buf);
+	(void) zfs_refcount_add_many(&abd->abd_children, n, buf);
 
 	return (buf);
 }
@@ -588,7 +588,7 @@ abd_return_buf(abd_t *abd, void *buf, size_t n)
 		ASSERT0(abd_cmp_buf(abd, buf, n));
 		zio_buf_free(buf, n);
 	}
-	(void) refcount_remove_many(&abd->abd_children, n, buf);
+	(void) zfs_refcount_remove_many(&abd->abd_children, n, buf);
 }
 
 void
diff --git a/usr/src/uts/common/fs/zfs/arc.c b/usr/src/uts/common/fs/zfs/arc.c
index d2a828b520..469106c7d7 100644
--- a/usr/src/uts/common/fs/zfs/arc.c
+++ b/usr/src/uts/common/fs/zfs/arc.c
@@ -429,12 +429,12 @@ typedef struct arc_state {
 	/*
 	 * total amount of evictable data in this state
 	 */
-	refcount_t arcs_esize[ARC_BUFC_NUMTYPES];
+	zfs_refcount_t arcs_esize[ARC_BUFC_NUMTYPES];
 	/*
 	 * total amount of data in this state; this includes: evictable,
 	 * non-evictable, ARC_BUFC_DATA, and ARC_BUFC_METADATA.
 	 */
-	refcount_t arcs_size;
+	zfs_refcount_t arcs_size;
 } arc_state_t;
 
 /* The 6 states: */
@@ -948,7 +948,7 @@ typedef struct l1arc_buf_hdr {
 	clock_t			b_arc_access;
 
 	/* self protecting */
-	refcount_t		b_refcnt;
+	zfs_refcount_t		b_refcnt;
 
 	arc_callback_t		*b_acb;
 	abd_t			*b_pabd;
@@ -1125,7 +1125,7 @@ struct l2arc_dev {
 	kmutex_t		l2ad_mtx;	/* lock for buffer list */
 	list_t			l2ad_buflist;	/* buffer list */
 	list_node_t		l2ad_node;	/* device list node */
-	refcount_t		l2ad_alloc;	/* allocated bytes */
+	zfs_refcount_t		l2ad_alloc;	/* allocated bytes */
 };
 
 static list_t L2ARC_dev_list;			/* device list */
@@ -1342,7 +1342,7 @@ hdr_full_cons(void *vbuf, void *unused, int kmflag)
 
 	bzero(hdr, HDR_FULL_SIZE);
 	cv_init(&hdr->b_l1hdr.b_cv, NULL, CV_DEFAULT, NULL);
-	refcount_create(&hdr->b_l1hdr.b_refcnt);
+	zfs_refcount_create(&hdr->b_l1hdr.b_refcnt);
 	mutex_init(&hdr->b_l1hdr.b_freeze_lock, NULL, MUTEX_DEFAULT, NULL);
 	multilist_link_init(&hdr->b_l1hdr.b_arc_node);
 	arc_space_consume(HDR_FULL_SIZE, ARC_SPACE_HDRS);
@@ -1387,7 +1387,7 @@ hdr_full_dest(void *vbuf, void *unused)
 
 	ASSERT(HDR_EMPTY(hdr));
 	cv_destroy(&hdr->b_l1hdr.b_cv);
-	refcount_destroy(&hdr->b_l1hdr.b_refcnt);
+	zfs_refcount_destroy(&hdr->b_l1hdr.b_refcnt);
 	mutex_destroy(&hdr->b_l1hdr.b_freeze_lock);
 	ASSERT(!multilist_link_active(&hdr->b_l1hdr.b_arc_node));
 	arc_space_return(HDR_FULL_SIZE, ARC_SPACE_HDRS);
@@ -2066,21 +2066,21 @@ arc_evictable_space_increment(arc_buf_hdr_t *hdr, arc_state_t *state)
 		ASSERT0(hdr->b_l1hdr.b_bufcnt);
 		ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
 		ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
-		(void) refcount_add_many(&state->arcs_esize[type],
+		(void) zfs_refcount_add_many(&state->arcs_esize[type],
 		    HDR_GET_LSIZE(hdr), hdr);
 		return;
 	}
 
 	ASSERT(!GHOST_STATE(state));
 	if (hdr->b_l1hdr.b_pabd != NULL) {
-		(void) refcount_add_many(&state->arcs_esize[type],
+		(void) zfs_refcount_add_many(&state->arcs_esize[type],
 		    arc_hdr_size(hdr), hdr);
 	}
 	for (arc_buf_t *buf = hdr->b_l1hdr.b_buf; buf != NULL;
 	    buf = buf->b_next) {
 		if (arc_buf_is_shared(buf))
 			continue;
-		(void) refcount_add_many(&state->arcs_esize[type],
+		(void) zfs_refcount_add_many(&state->arcs_esize[type],
 		    arc_buf_size(buf), buf);
 	}
 }
@@ -2101,21 +2101,21 @@ arc_evictable_space_decrement(arc_buf_hdr_t *hdr, arc_state_t *state)
 		ASSERT0(hdr->b_l1hdr.b_bufcnt);
 		ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
 		ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
-		(void) refcount_remove_many(&state->arcs_esize[type],
+		(void) zfs_refcount_remove_many(&state->arcs_esize[type],
 		    HDR_GET_LSIZE(hdr), hdr);
 		return;
 	}
 
 	ASSERT(!GHOST_STATE(state));
 	if (hdr->b_l1hdr.b_pabd != NULL) {
-		(void) refcount_remove_many(&state->arcs_esize[type],
+		(void) zfs_refcount_remove_many(&state->arcs_esize[type],
 		    arc_hdr_size(hdr), hdr);
 	}
 	for (arc_buf_t *buf = hdr->b_l1hdr.b_buf; buf != NULL;
 	    buf = buf->b_next) {
 		if (arc_buf_is_shared(buf))
 			continue;
-		(void) refcount_remove_many(&state->arcs_esize[type],
+		(void) zfs_refcount_remove_many(&state->arcs_esize[type],
 		    arc_buf_size(buf), buf);
 	}
 }
@@ -2132,13 +2132,13 @@ add_reference(arc_buf_hdr_t *hdr, void *tag)
 	ASSERT(HDR_HAS_L1HDR(hdr));
 	if (!MUTEX_HELD(HDR_LOCK(hdr))) {
 		ASSERT(hdr->b_l1hdr.b_state == arc_anon);
-		ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
+		ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
 		ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
 	}
 
 	arc_state_t *state = hdr->b_l1hdr.b_state;
 
-	if ((refcount_add(&hdr->b_l1hdr.b_refcnt, tag) == 1) &&
+	if ((zfs_refcount_add(&hdr->b_l1hdr.b_refcnt, tag) == 1) &&
 	    (state != arc_anon)) {
 		/* We don't use the L2-only state list. */
 		if (state != arc_l2c_only) {
@@ -2170,7 +2170,7 @@ remove_reference(arc_buf_hdr_t *hdr, kmutex_t *hash_lock, void *tag)
 	 * arc_l2c_only counts as a ghost state so we don't need to explicitly
 	 * check to prevent usage of the arc_l2c_only list.
 	 */
-	if (((cnt = refcount_remove(&hdr->b_l1hdr.b_refcnt, tag)) == 0) &&
+	if (((cnt = zfs_refcount_remove(&hdr->b_l1hdr.b_refcnt, tag)) == 0) &&
 	    (state != arc_anon)) {
 		multilist_insert(state->arcs_list[arc_buf_type(hdr)], hdr);
 		ASSERT3U(hdr->b_l1hdr.b_bufcnt, >, 0);
@@ -2202,7 +2202,7 @@ arc_change_state(arc_state_t *new_state, arc_buf_hdr_t *hdr,
 	 */
 	if (HDR_HAS_L1HDR(hdr)) {
 		old_state = hdr->b_l1hdr.b_state;
-		refcnt = refcount_count(&hdr->b_l1hdr.b_refcnt);
+		refcnt = zfs_refcount_count(&hdr->b_l1hdr.b_refcnt);
 		bufcnt = hdr->b_l1hdr.b_bufcnt;
 		update_old = (bufcnt > 0 || hdr->b_l1hdr.b_pabd != NULL);
 	} else {
@@ -2272,7 +2272,7 @@ arc_change_state(arc_state_t *new_state, arc_buf_hdr_t *hdr,
 			 * the reference. As a result, we use the arc
 			 * header pointer for the reference.
 			 */
-			(void) refcount_add_many(&new_state->arcs_size,
+			(void) zfs_refcount_add_many(&new_state->arcs_size,
 			    HDR_GET_LSIZE(hdr), hdr);
 			ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
 		} else {
@@ -2298,13 +2298,15 @@ arc_change_state(arc_state_t *new_state, arc_buf_hdr_t *hdr,
 				if (arc_buf_is_shared(buf))
 					continue;
 
-				(void) refcount_add_many(&new_state->arcs_size,
+				(void) zfs_refcount_add_many(
+				    &new_state->arcs_size,
 				    arc_buf_size(buf), buf);
 			}
 			ASSERT3U(bufcnt, ==, buffers);
 
 			if (hdr->b_l1hdr.b_pabd != NULL) {
-				(void) refcount_add_many(&new_state->arcs_size,
+				(void) zfs_refcount_add_many(
+				    &new_state->arcs_size,
 				    arc_hdr_size(hdr), hdr);
 			} else {
 				ASSERT(GHOST_STATE(old_state));
@@ -2326,7 +2328,7 @@ arc_change_state(arc_state_t *new_state, arc_buf_hdr_t *hdr,
 			 * header on the ghost state.
 			 */
 
-			(void) refcount_remove_many(&old_state->arcs_size,
+			(void) zfs_refcount_remove_many(&old_state->arcs_size,
 			    HDR_GET_LSIZE(hdr), hdr);
 		} else {
 			uint32_t buffers = 0;
@@ -2351,13 +2353,13 @@ arc_change_state(arc_state_t *new_state, arc_buf_hdr_t *hdr,
 				if (arc_buf_is_shared(buf))
 					continue;
 
-				(void) refcount_remove_many(
+				(void) zfs_refcount_remove_many(
 				    &old_state->arcs_size, arc_buf_size(buf),
 				    buf);
 			}
 			ASSERT3U(bufcnt, ==, buffers);
 			ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
-			(void) refcount_remove_many(
+			(void) zfs_refcount_remove_many(
 			    &old_state->arcs_size, arc_hdr_size(hdr), hdr);
 		}
 	}
@@ -2611,8 +2613,8 @@ arc_return_buf(arc_buf_t *buf, void *tag)
 
 	ASSERT3P(buf->b_data, !=, NULL);
 	ASSERT(HDR_HAS_L1HDR(hdr));
-	(void) refcount_add(&hdr->b_l1hdr.b_refcnt, tag);
-	(void) refcount_remove(&hdr->b_l1hdr.b_refcnt, arc_onloan_tag);
+	(void) zfs_refcount_add(&hdr->b_l1hdr.b_refcnt, tag);
+	(void) zfs_refcount_remove(&hdr->b_l1hdr.b_refcnt, arc_onloan_tag);
 
 	arc_loaned_bytes_update(-arc_buf_size(buf));
 }
@@ -2625,8 +2627,8 @@ arc_loan_inuse_buf(arc_buf_t *buf, void *tag)
 
 	ASSERT3P(buf->b_data, !=, NULL);
 	ASSERT(HDR_HAS_L1HDR(hdr));
-	(void) refcount_add(&hdr->b_l1hdr.b_refcnt, arc_onloan_tag);
-	(void) refcount_remove(&hdr->b_l1hdr.b_refcnt, tag);
+	(void) zfs_refcount_add(&hdr->b_l1hdr.b_refcnt, arc_onloan_tag);
+	(void) zfs_refcount_remove(&hdr->b_l1hdr.b_refcnt, tag);
 
 	arc_loaned_bytes_update(arc_buf_size(buf));
 }
@@ -2653,13 +2655,13 @@ arc_hdr_free_on_write(arc_buf_hdr_t *hdr)
 
 	/* protected by hash lock, if in the hash table */
 	if (multilist_link_active(&hdr->b_l1hdr.b_arc_node)) {
-		ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
+		ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
 		ASSERT(state != arc_anon && state != arc_l2c_only);
 
-		(void) refcount_remove_many(&state->arcs_esize[type],
+		(void) zfs_refcount_remove_many(&state->arcs_esize[type],
 		    size, hdr);
 	}
-	(void) refcount_remove_many(&state->arcs_size, size, hdr);
+	(void) zfs_refcount_remove_many(&state->arcs_size, size, hdr);
 	if (type == ARC_BUFC_METADATA) {
 		arc_space_return(size, ARC_SPACE_META);
 	} else {
@@ -2689,7 +2691,7 @@ arc_share_buf(arc_buf_hdr_t *hdr, arc_buf_t *buf)
 	 * refcount ownership to the hdr since it always owns
 	 * the refcount whenever an arc_buf_t is shared.
 	 */
-	refcount_transfer_ownership(&state->arcs_size, buf, hdr);
+	zfs_refcount_transfer_ownership(&state->arcs_size, buf, hdr);
 	hdr->b_l1hdr.b_pabd = abd_get_from_buf(buf->b_data, arc_buf_size(buf));
 	abd_take_ownership_of_buf(hdr->b_l1hdr.b_pabd,
 	    HDR_ISTYPE_METADATA(hdr));
@@ -2719,7 +2721,7 @@ arc_unshare_buf(arc_buf_hdr_t *hdr, arc_buf_t *buf)
 	 * We are no longer sharing this buffer so we need
 	 * to transfer its ownership to the rightful owner.
 	 */
-	refcount_transfer_ownership(&state->arcs_size, hdr, buf);
+	zfs_refcount_transfer_ownership(&state->arcs_size, hdr, buf);
 	arc_hdr_clear_flags(hdr, ARC_FLAG_SHARED_DATA);
 	abd_release_ownership_of_buf(hdr->b_l1hdr.b_pabd);
 	abd_put(hdr->b_l1hdr.b_pabd);
@@ -2944,7 +2946,7 @@ arc_hdr_alloc(uint64_t spa, int32_t psize, int32_t lsize,
 	 * it references and compressed arc enablement.
 	 */
 	arc_hdr_alloc_pabd(hdr);
-	ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
+	ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
 
 	return (hdr);
 }
@@ -3046,8 +3048,10 @@ arc_hdr_realloc(arc_buf_hdr_t *hdr, kmem_cache_t *old, kmem_cache_t *new)
 	 * the wrong pointer address when calling arc_hdr_destroy() later.
 	 */
 
-	(void) refcount_remove_many(&dev->l2ad_alloc, arc_hdr_size(hdr), hdr);
-	(void) refcount_add_many(&dev->l2ad_alloc, arc_hdr_size(nhdr), nhdr);
+	(void) zfs_refcount_remove_many(&dev->l2ad_alloc, arc_hdr_size(hdr),
+	    hdr);
+	(void) zfs_refcount_add_many(&dev->l2ad_alloc, arc_hdr_size(nhdr),
+	    nhdr);
 
 	buf_discard_identity(hdr);
 	kmem_cache_free(old, hdr);
@@ -3127,7 +3131,7 @@ arc_hdr_l2hdr_destroy(arc_buf_hdr_t *hdr)
 
 	vdev_space_update(dev->l2ad_vdev, -psize, 0, 0);
 
-	(void) refcount_remove_many(&dev->l2ad_alloc, psize, hdr);
+	(void) zfs_refcount_remove_many(&dev->l2ad_alloc, psize, hdr);
 	arc_hdr_clear_flags(hdr, ARC_FLAG_HAS_L2HDR);
 }
 
@@ -3137,7 +3141,7 @@ arc_hdr_destroy(arc_buf_hdr_t *hdr)
 	if (HDR_HAS_L1HDR(hdr)) {
 		ASSERT(hdr->b_l1hdr.b_buf == NULL ||
 		    hdr->b_l1hdr.b_bufcnt > 0);
-		ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
+		ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
 		ASSERT3P(hdr->b_l1hdr.b_state, ==, arc_anon);
 	}
 	ASSERT(!HDR_IO_IN_PROGRESS(hdr));
@@ -3298,7 +3302,7 @@ arc_evict_hdr(arc_buf_hdr_t *hdr, kmutex_t *hash_lock)
 		return (bytes_evicted);
 	}
 
-	ASSERT0(refcount_count(&hdr->b_l1hdr.b_refcnt));
+	ASSERT0(zfs_refcount_count(&hdr->b_l1hdr.b_refcnt));
 	while (hdr->b_l1hdr.b_buf) {
 		arc_buf_t *buf = hdr->b_l1hdr.b_buf;
 		if (!mutex_tryenter(&buf->b_evict_lock)) {
@@ -3600,7 +3604,7 @@ arc_flush_state(arc_state_t *state, uint64_t spa, arc_buf_contents_t type,
 {
 	uint64_t evicted = 0;
 
-	while (refcount_count(&state->arcs_esize[type]) != 0) {
+	while (zfs_refcount_count(&state->arcs_esize[type]) != 0) {
 		evicted += arc_evict_state(state, spa, ARC_EVICT_ALL, type);
 
 		if (!retry)
@@ -3624,8 +3628,9 @@ arc_adjust_impl(arc_state_t *state, uint64_t spa, int64_t bytes,
 {
 	int64_t delta;
 
-	if (bytes > 0 && refcount_count(&state->arcs_esize[type]) > 0) {
-		delta = MIN(refcount_count(&state->arcs_esize[type]), bytes);
+	if (bytes > 0 && zfs_refcount_count(&state->arcs_esize[type]) > 0) {
+		delta = MIN(zfs_refcount_count(&state->arcs_esize[type]),
+		    bytes);
 		return (arc_evict_state(state, spa, delta, type));
 	}
 
@@ -3650,8 +3655,8 @@ arc_adjust_meta(uint64_t meta_used)
 	 * evict some from the MRU here, and some from the MFU below.
 	 */
 	target = MIN((int64_t)(meta_used - arc_meta_limit),
-	    (int64_t)(refcount_count(&arc_anon->arcs_size) +
-	    refcount_count(&arc_mru->arcs_size) - arc_p));
+	    (int64_t)(zfs_refcount_count(&arc_anon->arcs_size) +
+	    zfs_refcount_count(&arc_mru->arcs_size) - arc_p));
 
 	total_evicted += arc_adjust_impl(arc_mru, 0, target, ARC_BUFC_METADATA);
 
@@ -3661,7 +3666,7 @@ arc_adjust_meta(uint64_t meta_used)
 	 * space allotted to the MFU (which is defined as arc_c - arc_p).
 	 */
 	target = MIN((int64_t)(meta_used - arc_meta_limit),
-	    (int64_t)(refcount_count(&arc_mfu->arcs_size) -
+	    (int64_t)(zfs_refcount_count(&arc_mfu->arcs_size) -
 	    (arc_c - arc_p)));
 
 	total_evicted += arc_adjust_impl(arc_mfu, 0, target, ARC_BUFC_METADATA);
@@ -3773,8 +3778,8 @@ arc_adjust(void)
 	 * arc_p here, and then evict more from the MFU below.
 	 */
 	target = MIN((int64_t)(asize - arc_c),
-	    (int64_t)(refcount_count(&arc_anon->arcs_size) +
-	    refcount_count(&arc_mru->arcs_size) + ameta - arc_p));
+	    (int64_t)(zfs_refcount_count(&arc_anon->arcs_size) +
+	    zfs_refcount_count(&arc_mru->arcs_size) + ameta - arc_p));
 
 	/*
 	 * If we're below arc_meta_min, always prefer to evict data.
@@ -3858,8 +3863,8 @@ arc_adjust(void)
 	 * cache. The following logic enforces these limits on the ghost
 	 * caches, and evicts from them as needed.
 	 */
-	target = refcount_count(&arc_mru->arcs_size) +
-	    refcount_count(&arc_mru_ghost->arcs_size) - arc_c;
+	target = zfs_refcount_count(&arc_mru->arcs_size) +
+	    zfs_refcount_count(&arc_mru_ghost->arcs_size) - arc_c;
 
 	bytes = arc_adjust_impl(arc_mru_ghost, 0, target, ARC_BUFC_DATA);
 	total_evicted += bytes;
@@ -3877,8 +3882,8 @@ arc_adjust(void)
 	 *	mru + mfu + mru ghost + mfu ghost <= 2 * arc_c
 	 *		    mru ghost + mfu ghost <= arc_c
 	 */
-	target = refcount_count(&arc_mru_ghost->arcs_size) +
-	    refcount_count(&arc_mfu_ghost->arcs_size) - arc_c;
+	target = zfs_refcount_count(&arc_mru_ghost->arcs_size) +
+	    zfs_refcount_count(&arc_mfu_ghost->arcs_size) - arc_c;
 
 	bytes = arc_adjust_impl(arc_mfu_ghost, 0, target, ARC_BUFC_DATA);
 	total_evicted += bytes;
@@ -4316,8 +4321,8 @@ arc_adapt(int bytes, arc_state_t *state)
 {
 	int mult;
 	uint64_t arc_p_min = (arc_c >> arc_p_min_shift);
-	int64_t mrug_size = refcount_count(&arc_mru_ghost->arcs_size);
-	int64_t mfug_size = refcount_count(&arc_mfu_ghost->arcs_size);
+	int64_t mrug_size = zfs_refcount_count(&arc_mru_ghost->arcs_size);
+	int64_t mfug_size = zfs_refcount_count(&arc_mfu_ghost->arcs_size);
 
 	if (state == arc_l2c_only)
 		return;
@@ -4494,7 +4499,7 @@ arc_get_data_impl(arc_buf_hdr_t *hdr, uint64_t size, void *tag)
 	 */
 	if (!GHOST_STATE(state)) {
 
-		(void) refcount_add_many(&state->arcs_size, size, tag);
+		(void) zfs_refcount_add_many(&state->arcs_size, size, tag);
 
 		/*
 		 * If this is reached via arc_read, the link is
@@ -4506,8 +4511,8 @@ arc_get_data_impl(arc_buf_hdr_t *hdr, uint64_t size, void *tag)
 		 * trying to [add|remove]_reference it.
 		 */
 		if (multilist_link_active(&hdr->b_l1hdr.b_arc_node)) {
-			ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
-			(void) refcount_add_many(&state->arcs_esize[type],
+			ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
+			(void) zfs_refcount_add_many(&state->arcs_esize[type],
 			    size, tag);
 		}
 
@@ -4517,8 +4522,8 @@ arc_get_data_impl(arc_buf_hdr_t *hdr, uint64_t size, void *tag)
 		 */
 		if (aggsum_compare(&arc_size, arc_c) < 0 &&
 		    hdr->b_l1hdr.b_state == arc_anon &&
-		    (refcount_count(&arc_anon->arcs_size) +
-		    refcount_count(&arc_mru->arcs_size) > arc_p))
+		    (zfs_refcount_count(&arc_anon->arcs_size) +
+		    zfs_refcount_count(&arc_mru->arcs_size) > arc_p))
 			arc_p = MIN(arc_c, arc_p + size);
 	}
 }
@@ -4555,13 +4560,13 @@ arc_free_data_impl(arc_buf_hdr_t *hdr, uint64_t size, void *tag)
 
 	/* protected by hash lock, if in the hash table */
 	if (multilist_link_active(&hdr->b_l1hdr.b_arc_node)) {
-		ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
+		ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
 		ASSERT(state != arc_anon && state != arc_l2c_only);
 
-		(void) refcount_remove_many(&state->arcs_esize[type],
+		(void) zfs_refcount_remove_many(&state->arcs_esize[type],
 		    size, tag);
 	}
-	(void) refcount_remove_many(&state->arcs_size, size, tag);
+	(void) zfs_refcount_remove_many(&state->arcs_size, size, tag);
 
 	VERIFY3U(hdr->b_type, ==, type);
 	if (type == ARC_BUFC_METADATA) {
@@ -4608,7 +4613,7 @@ arc_access(arc_buf_hdr_t *hdr, kmutex_t *hash_lock)
 		 *   another prefetch (to make it less likely to be evicted).
 		 */
 		if (HDR_PREFETCH(hdr)) {
-			if (refcount_count(&hdr->b_l1hdr.b_refcnt) == 0) {
+			if (zfs_refcount_count(&hdr->b_l1hdr.b_refcnt) == 0) {
 				/* link protected by hash lock */
 				ASSERT(multilist_link_active(
 				    &hdr->b_l1hdr.b_arc_node));
@@ -4646,7 +4651,7 @@ arc_access(arc_buf_hdr_t *hdr, kmutex_t *hash_lock)
 
 		if (HDR_PREFETCH(hdr)) {
 			new_state = arc_mru;
-			if (refcount_count(&hdr->b_l1hdr.b_refcnt) > 0)
+			if (zfs_refcount_count(&hdr->b_l1hdr.b_refcnt) > 0)
 				arc_hdr_clear_flags(hdr, ARC_FLAG_PREFETCH);
 			DTRACE_PROBE1(new_state__mru, arc_buf_hdr_t *, hdr);
 		} else {
@@ -4669,7 +4674,7 @@ arc_access(arc_buf_hdr_t *hdr, kmutex_t *hash_lock)
 		 * the head of the list now.
 		 */
 		if ((HDR_PREFETCH(hdr)) != 0) {
-			ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
+			ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
 			/* link protected by hash_lock */
 			ASSERT(multilist_link_active(&hdr->b_l1hdr.b_arc_node));
 		}
@@ -4688,7 +4693,7 @@ arc_access(arc_buf_hdr_t *hdr, kmutex_t *hash_lock)
 			 * This is a prefetch access...
 			 * move this block back to the MRU state.
 			 */
-			ASSERT0(refcount_count(&hdr->b_l1hdr.b_refcnt));
+			ASSERT0(zfs_refcount_count(&hdr->b_l1hdr.b_refcnt));
 			new_state = arc_mru;
 		}
 
@@ -4870,7 +4875,7 @@ arc_read_done(zio_t *zio)
 		ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
 	}
 
-	ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt) ||
+	ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt) ||
 	    callback_list != NULL);
 
 	if (no_zio_error) {
@@ -4881,7 +4886,7 @@ arc_read_done(zio_t *zio)
 			arc_change_state(arc_anon, hdr, hash_lock);
 		if (HDR_IN_HASH_TABLE(hdr))
 			buf_hash_remove(hdr);
-		freeable = refcount_is_zero(&hdr->b_l1hdr.b_refcnt);
+		freeable = zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt);
 	}
 
 	/*
@@ -4901,7 +4906,7 @@ arc_read_done(zio_t *zio)
 		 * in the cache).
 		 */
 		ASSERT3P(hdr->b_l1hdr.b_state, ==, arc_anon);
-		freeable = refcount_is_zero(&hdr->b_l1hdr.b_refcnt);
+		freeable = zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt);
 	}
 
 	/* execute each callback and free its structure */
@@ -5063,7 +5068,7 @@ top:
 			VERIFY0(arc_buf_alloc_impl(hdr, private,
 			    compressed_read, B_TRUE, &buf));
 		} else if (*arc_flags & ARC_FLAG_PREFETCH &&
-		    refcount_count(&hdr->b_l1hdr.b_refcnt) == 0) {
+		    zfs_refcount_count(&hdr->b_l1hdr.b_refcnt) == 0) {
 			arc_hdr_set_flags(hdr, ARC_FLAG_PREFETCH);
 		}
 		DTRACE_PROBE1(arc__hit, arc_buf_hdr_t *, hdr);
@@ -5119,7 +5124,7 @@ top:
 			ASSERT3P(hdr->b_l1hdr.b_pabd, ==, NULL);
 			ASSERT(GHOST_STATE(hdr->b_l1hdr.b_state));
 			ASSERT(!HDR_IO_IN_PROGRESS(hdr));
-			ASSERT(refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
+			ASSERT(zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
 			ASSERT3P(hdr->b_l1hdr.b_buf, ==, NULL);
 			ASSERT3P(hdr->b_l1hdr.b_freeze_cksum, ==, NULL);
 
@@ -5348,7 +5353,7 @@ arc_freed(spa_t *spa, const blkptr_t *bp)
 	 * this hdr, then we don't destroy the hdr.
 	 */
 	if (!HDR_HAS_L1HDR(hdr) || (!HDR_IO_IN_PROGRESS(hdr) &&
-	    refcount_is_zero(&hdr->b_l1hdr.b_refcnt))) {
+	    zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt))) {
 		arc_change_state(arc_anon, hdr, hash_lock);
 		arc_hdr_destroy(hdr);
 		mutex_exit(hash_lock);
@@ -5392,7 +5397,7 @@ arc_release(arc_buf_t *buf, void *tag)
 		ASSERT(HDR_EMPTY(hdr));
 
 		ASSERT3U(hdr->b_l1hdr.b_bufcnt, ==, 1);
-		ASSERT3S(refcount_count(&hdr->b_l1hdr.b_refcnt), ==, 1);
+		ASSERT3S(zfs_refcount_count(&hdr->b_l1hdr.b_refcnt), ==, 1);
 		ASSERT(!list_link_active(&hdr->b_l1hdr.b_arc_node));
 
 		hdr->b_l1hdr.b_arc_access = 0;
@@ -5420,7 +5425,7 @@ arc_release(arc_buf_t *buf, void *tag)
 	ASSERT3P(state, !=, arc_anon);
 
 	/* this buffer is not on any list */
-	ASSERT3S(refcount_count(&hdr->b_l1hdr.b_refcnt), >, 0);
+	ASSERT3S(zfs_refcount_count(&hdr->b_l1hdr.b_refcnt), >, 0);
 
 	if (HDR_HAS_L2HDR(hdr)) {
 		mutex_enter(&hdr->b_l2hdr.b_dev->l2ad_mtx);
@@ -5510,12 +5515,13 @@ arc_release(arc_buf_t *buf, void *tag)
 		ASSERT3P(hdr->b_l1hdr.b_pabd, !=, NULL);
 		ASSERT3P(state, !=, arc_l2c_only);
 
-		(void) refcount_remove_many(&state->arcs_size,
+		(void) zfs_refcount_remove_many(&state->arcs_size,
 		    arc_buf_size(buf), buf);
 
-		if (refcount_is_zero(&hdr->b_l1hdr.b_refcnt)) {
+		if (zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt)) {
 			ASSERT3P(state, !=, arc_l2c_only);
-			(void) refcount_remove_many(&state->arcs_esize[type],
+			(void) zfs_refcount_remove_many(
+			    &state->arcs_esize[type],
 			    arc_buf_size(buf), buf);
 		}
 
@@ -5532,21 +5538,21 @@ arc_release(arc_buf_t *buf, void *tag)
 		nhdr = arc_hdr_alloc(spa, psize, lsize, compress, type);
 		ASSERT3P(nhdr->b_l1hdr.b_buf, ==, NULL);
 		ASSERT0(nhdr->b_l1hdr.b_bufcnt);
-		ASSERT0(refcount_count(&nhdr->b_l1hdr.b_refcnt));
+		ASSERT0(zfs_refcount_count(&nhdr->b_l1hdr.b_refcnt));
 		VERIFY3U(nhdr->b_type, ==, type);
 		ASSERT(!HDR_SHARED_DATA(nhdr));
 
 		nhdr->b_l1hdr.b_buf = buf;
 		nhdr->b_l1hdr.b_bufcnt = 1;
-		(void) refcount_add(&nhdr->b_l1hdr.b_refcnt, tag);
+		(void) zfs_refcount_add(&nhdr->b_l1hdr.b_refcnt, tag);
 		buf->b_hdr = nhdr;
 
 		mutex_exit(&buf->b_evict_lock);
-		(void) refcount_add_many(&arc_anon->arcs_size,
+		(void) zfs_refcount_add_many(&arc_anon->arcs_size,
 		    arc_buf_size(buf), buf);
 	} else {
 		mutex_exit(&buf->b_evict_lock);
-		ASSERT(refcount_count(&hdr->b_l1hdr.b_refcnt) == 1);
+		ASSERT(zfs_refcount_count(&hdr->b_l1hdr.b_refcnt) == 1);
 		/* protected by hash lock, or hdr is on arc_anon */
 		ASSERT(!multilist_link_active(&hdr->b_l1hdr.b_arc_node));
 		ASSERT(!HDR_IO_IN_PROGRESS(hdr));
@@ -5578,7 +5584,7 @@ arc_referenced(arc_buf_t *buf)
 	int referenced;
 
 	mutex_enter(&buf->b_evict_lock);
-	referenced = (refcount_count(&buf->b_hdr->b_l1hdr.b_refcnt));
+	referenced = (zfs_refcount_count(&buf->b_hdr->b_l1hdr.b_refcnt));
 	mutex_exit(&buf->b_evict_lock);
 	return (referenced);
 }
@@ -5593,7 +5599,7 @@ arc_write_ready(zio_t *zio)
 	uint64_t psize = BP_IS_HOLE(zio->io_bp) ? 0 : BP_GET_PSIZE(zio->io_bp);
 
 	ASSERT(HDR_HAS_L1HDR(hdr));
-	ASSERT(!refcount_is_zero(&buf->b_hdr->b_l1hdr.b_refcnt));
+	ASSERT(!zfs_refcount_is_zero(&buf->b_hdr->b_l1hdr.b_refcnt));
 	ASSERT(hdr->b_l1hdr.b_bufcnt > 0);
 
 	/*
@@ -5746,7 +5752,7 @@ arc_write_done(zio_t *zio)
 				if (!BP_EQUAL(&zio->io_bp_orig, zio->io_bp))
 					panic("bad overwrite, hdr=%p exists=%p",
 					    (void *)hdr, (void *)exists);
-				ASSERT(refcount_is_zero(
+				ASSERT(zfs_refcount_is_zero(
 				    &exists->b_l1hdr.b_refcnt));
 				arc_change_state(arc_anon, exists, hash_lock);
 				mutex_exit(hash_lock);
@@ -5776,7 +5782,7 @@ arc_write_done(zio_t *zio)
 		arc_hdr_clear_flags(hdr, ARC_FLAG_IO_IN_PROGRESS);
 	}
 
-	ASSERT(!refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
+	ASSERT(!zfs_refcount_is_zero(&hdr->b_l1hdr.b_refcnt));
 	callback->awcb_done(zio, buf, callback->awcb_private);
 
 	abd_put(zio->io_abd);
@@ -5921,7 +5927,7 @@ arc_tempreserve_space(spa_t *spa, uint64_t reserve, uint64_t txg)
 	/* assert that it has not wrapped around */
 	ASSERT3S(atomic_add_64_nv(&arc_loaned_bytes, 0), >=, 0);
 
-	anon_size = MAX((int64_t)(refcount_count(&arc_anon->arcs_size) -
+	anon_size = MAX((int64_t)(zfs_refcount_count(&arc_anon->arcs_size) -
 	    arc_loaned_bytes), 0);
 
 	/*
@@ -5956,9 +5962,10 @@ arc_tempreserve_space(spa_t *spa, uint64_t reserve, uint64_t txg)
 	    anon_size > arc_c * zfs_arc_anon_limit_percent / 100 &&
 	    spa_dirty_anon > anon_size * zfs_arc_pool_dirty_percent / 100) {
 		uint64_t meta_esize =
-		    refcount_count(&arc_anon->arcs_esize[ARC_BUFC_METADATA]);
+		    zfs_refcount_count(
+		    &arc_anon->arcs_esize[ARC_BUFC_METADATA]);
 		uint64_t data_esize =
-		    refcount_count(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
+		    zfs_refcount_count(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
 		dprintf("failing, arc_tempreserve=%lluK anon_meta=%lluK "
 		    "anon_data=%lluK tempreserve=%lluK arc_c=%lluK\n",
 		    arc_tempreserve >> 10, meta_esize >> 10,
@@ -5973,11 +5980,11 @@ static void
 arc_kstat_update_state(arc_state_t *state, kstat_named_t *size,
     kstat_named_t *evict_data, kstat_named_t *evict_metadata)
 {
-	size->value.ui64 = refcount_count(&state->arcs_size);
+	size->value.ui64 = zfs_refcount_count(&state->arcs_size);
 	evict_data->value.ui64 =
-	    refcount_count(&state->arcs_esize[ARC_BUFC_DATA]);
+	    zfs_refcount_count(&state->arcs_esize[ARC_BUFC_DATA]);
 	evict_metadata->value.ui64 =
-	    refcount_count(&state->arcs_esize[ARC_BUFC_METADATA]);
+	    zfs_refcount_count(&state->arcs_esize[ARC_BUFC_METADATA]);
 }
 
 static int
@@ -6108,25 +6115,25 @@ arc_state_init(void)
 	    offsetof(arc_buf_hdr_t, b_l1hdr.b_arc_node),
 	    arc_state_multilist_index_func);
 
-	refcount_create(&arc_anon->arcs_esize[ARC_BUFC_METADATA]);
-	refcount_create(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
-	refcount_create(&arc_mru->arcs_esize[ARC_BUFC_METADATA]);
-	refcount_create(&arc_mru->arcs_esize[ARC_BUFC_DATA]);
-	refcount_create(&arc_mru_ghost->arcs_esize[ARC_BUFC_METADATA]);
-	refcount_create(&arc_mru_ghost->arcs_esize[ARC_BUFC_DATA]);
-	refcount_create(&arc_mfu->arcs_esize[ARC_BUFC_METADATA]);
-	refcount_create(&arc_mfu->arcs_esize[ARC_BUFC_DATA]);
-	refcount_create(&arc_mfu_ghost->arcs_esize[ARC_BUFC_METADATA]);
-	refcount_create(&arc_mfu_ghost->arcs_esize[ARC_BUFC_DATA]);
-	refcount_create(&arc_l2c_only->arcs_esize[ARC_BUFC_METADATA]);
-	refcount_create(&arc_l2c_only->arcs_esize[ARC_BUFC_DATA]);
-
-	refcount_create(&arc_anon->arcs_size);
-	refcount_create(&arc_mru->arcs_size);
-	refcount_create(&arc_mru_ghost->arcs_size);
-	refcount_create(&arc_mfu->arcs_size);
-	refcount_create(&arc_mfu_ghost->arcs_size);
-	refcount_create(&arc_l2c_only->arcs_size);
+	zfs_refcount_create(&arc_anon->arcs_esize[ARC_BUFC_METADATA]);
+	zfs_refcount_create(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
+	zfs_refcount_create(&arc_mru->arcs_esize[ARC_BUFC_METADATA]);
+	zfs_refcount_create(&arc_mru->arcs_esize[ARC_BUFC_DATA]);
+	zfs_refcount_create(&arc_mru_ghost->arcs_esize[ARC_BUFC_METADATA]);
+	zfs_refcount_create(&arc_mru_ghost->arcs_esize[ARC_BUFC_DATA]);
+	zfs_refcount_create(&arc_mfu->arcs_esize[ARC_BUFC_METADATA]);
+	zfs_refcount_create(&arc_mfu->arcs_esize[ARC_BUFC_DATA]);
+	zfs_refcount_create(&arc_mfu_ghost->arcs_esize[ARC_BUFC_METADATA]);
+	zfs_refcount_create(&arc_mfu_ghost->arcs_esize[ARC_BUFC_DATA]);
+	zfs_refcount_create(&arc_l2c_only->arcs_esize[ARC_BUFC_METADATA]);
+	zfs_refcount_create(&arc_l2c_only->arcs_esize[ARC_BUFC_DATA]);
+
+	zfs_refcount_create(&arc_anon->arcs_size);
+	zfs_refcount_create(&arc_mru->arcs_size);
+	zfs_refcount_create(&arc_mru_ghost->arcs_size);
+	zfs_refcount_create(&arc_mfu->arcs_size);
+	zfs_refcount_create(&arc_mfu_ghost->arcs_size);
+	zfs_refcount_create(&arc_l2c_only->arcs_size);
 
 	aggsum_init(&arc_meta_used, 0);
 	aggsum_init(&arc_size, 0);
@@ -6140,25 +6147,25 @@ arc_state_init(void)
 static void
 arc_state_fini(void)
 {
-	refcount_destroy(&arc_anon->arcs_esize[ARC_BUFC_METADATA]);
-	refcount_destroy(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
-	refcount_destroy(&arc_mru->arcs_esize[ARC_BUFC_METADATA]);
-	refcount_destroy(&arc_mru->arcs_esize[ARC_BUFC_DATA]);
-	refcount_destroy(&arc_mru_ghost->arcs_esize[ARC_BUFC_METADATA]);
-	refcount_destroy(&arc_mru_ghost->arcs_esize[ARC_BUFC_DATA]);
-	refcount_destroy(&arc_mfu->arcs_esize[ARC_BUFC_METADATA]);
-	refcount_destroy(&arc_mfu->arcs_esize[ARC_BUFC_DATA]);
-	refcount_destroy(&arc_mfu_ghost->arcs_esize[ARC_BUFC_METADATA]);
-	refcount_destroy(&arc_mfu_ghost->arcs_esize[ARC_BUFC_DATA]);
-	refcount_destroy(&arc_l2c_only->arcs_esize[ARC_BUFC_METADATA]);
-	refcount_destroy(&arc_l2c_only->arcs_esize[ARC_BUFC_DATA]);
-
-	refcount_destroy(&arc_anon->arcs_size);
-	refcount_destroy(&arc_mru->arcs_size);
-	refcount_destroy(&arc_mru_ghost->arcs_size);
-	refcount_destroy(&arc_mfu->arcs_size);
-	refcount_destroy(&arc_mfu_ghost->arcs_size);
-	refcount_destroy(&arc_l2c_only->arcs_size);
+	zfs_refcount_destroy(&arc_anon->arcs_esize[ARC_BUFC_METADATA]);
+	zfs_refcount_destroy(&arc_anon->arcs_esize[ARC_BUFC_DATA]);
+	zfs_refcount_destroy(&arc_mru->arcs_esize[ARC_BUFC_METADATA]);
+	zfs_refcount_destroy(&arc_mru->arcs_esize[ARC_BUFC_DATA]);
+	zfs_refcount_destroy(&arc_mru_ghost->arcs_esize[ARC_BUFC_METADATA]);
+	zfs_refcount_destroy(&arc_mru_ghost->arcs_esize[ARC_BUFC_DATA]);
+	zfs_refcount_destroy(&arc_mfu->arcs_esize[ARC_BUFC_METADATA]);
+	zfs_refcount_destroy(&arc_mfu->arcs_esize[ARC_BUFC_DATA]);
+	zfs_refcount_destroy(&arc_mfu_ghost->arcs_esize[ARC_BUFC_METADATA]);
+	zfs_refcount_destroy(&arc_mfu_ghost->arcs_esize[ARC_BUFC_DATA]);
+	zfs_refcount_destroy(&arc_l2c_only->arcs_esize[ARC_BUFC_METADATA]);
+	zfs_refcount_destroy(&arc_l2c_only->arcs_esize[ARC_BUFC_DATA]);
+
+	zfs_refcount_destroy(&arc_anon->arcs_size);
+	zfs_refcount_destroy(&arc_mru->arcs_size);
+	zfs_refcount_destroy(&arc_mru_ghost->arcs_size);
+	zfs_refcount_destroy(&arc_mfu->arcs_size);
+	zfs_refcount_destroy(&arc_mfu_ghost->arcs_size);
+	zfs_refcount_destroy(&arc_l2c_only->arcs_size);
 
 	multilist_destroy(arc_mru->arcs_list[ARC_BUFC_METADATA]);
 	multilist_destroy(arc_mru_ghost->arcs_list[ARC_BUFC_METADATA]);
@@ -6742,7 +6749,7 @@ top:
 			ARCSTAT_INCR(arcstat_l2_lsize, -HDR_GET_LSIZE(hdr));
 
 			bytes_dropped += arc_hdr_size(hdr);
-			(void) refcount_remove_many(&dev->l2ad_alloc,
+			(void) zfs_refcount_remove_many(&dev->l2ad_alloc,
 			    arc_hdr_size(hdr), hdr);
 		}
 
@@ -7148,7 +7155,8 @@ l2arc_write_buffers(spa_t *spa, l2arc_dev_t *dev, uint64_t target_sz)
 			list_insert_head(&dev->l2ad_buflist, hdr);
 			mutex_exit(&dev->l2ad_mtx);
 
-			(void) refcount_add_many(&dev->l2ad_alloc, psize, hdr);
+			(void) zfs_refcount_add_many(&dev->l2ad_alloc, psize,
+			    hdr);
 
 			/*
 			 * Normally the L2ARC can use the hdr's data, but if
@@ -7380,7 +7388,7 @@ l2arc_add_vdev(spa_t *spa, vdev_t *vd)
 	    offsetof(arc_buf_hdr_t, b_l2hdr.b_l2node));
 
 	vdev_space_update(vd, 0, 0, adddev->l2ad_end - adddev->l2ad_hand);
-	refcount_create(&adddev->l2ad_alloc);
+	zfs_refcount_create(&adddev->l2ad_alloc);
 
 	/*
 	 * Add device to global list
@@ -7426,7 +7434,7 @@ l2arc_remove_vdev(vdev_t *vd)
 	l2arc_evict(remdev, 0, B_TRUE);
 	list_destroy(&remdev->l2ad_buflist);
 	mutex_destroy(&remdev->l2ad_mtx);
-	refcount_destroy(&remdev->l2ad_alloc);
+	zfs_refcount_destroy(&remdev->l2ad_alloc);
 	kmem_free(remdev, sizeof (l2arc_dev_t));
 }
 
diff --git a/usr/src/uts/common/fs/zfs/dbuf.c b/usr/src/uts/common/fs/zfs/dbuf.c
index ac448d734d..62458bad77 100644
--- a/usr/src/uts/common/fs/zfs/dbuf.c
+++ b/usr/src/uts/common/fs/zfs/dbuf.c
@@ -105,7 +105,7 @@ static boolean_t dbuf_evict_thread_exit;
  */
 typedef struct dbuf_cache {
 	multilist_t *cache;
-	refcount_t size;
+	zfs_refcount_t size;
 } dbuf_cache_t;
 dbuf_cache_t dbuf_caches[DB_CACHE_MAX];
 
@@ -178,7 +178,7 @@ dbuf_cons(void *vdb, void *unused, int kmflag)
 	mutex_init(&db->db_mtx, NULL, MUTEX_DEFAULT, NULL);
 	cv_init(&db->db_changed, NULL, CV_DEFAULT, NULL);
 	multilist_link_init(&db->db_cache_link);
-	refcount_create(&db->db_holds);
+	zfs_refcount_create(&db->db_holds);
 
 	return (0);
 }
@@ -191,7 +191,7 @@ dbuf_dest(void *vdb, void *unused)
 	mutex_destroy(&db->db_mtx);
 	cv_destroy(&db->db_changed);
 	ASSERT(!multilist_link_active(&db->db_cache_link));
-	refcount_destroy(&db->db_holds);
+	zfs_refcount_destroy(&db->db_holds);
 }
 
 /*
@@ -313,7 +313,7 @@ dbuf_hash_remove(dmu_buf_impl_t *db)
 	 * We musn't hold db_mtx to maintain lock ordering:
 	 * DBUF_HASH_MUTEX > db_mtx.
 	 */
-	ASSERT(refcount_is_zero(&db->db_holds));
+	ASSERT(zfs_refcount_is_zero(&db->db_holds));
 	ASSERT(db->db_state == DB_EVICTING);
 	ASSERT(!MUTEX_HELD(&db->db_mtx));
 
@@ -350,7 +350,7 @@ dbuf_verify_user(dmu_buf_impl_t *db, dbvu_verify_type_t verify_type)
 	ASSERT(db->db.db_data != NULL);
 	ASSERT3U(db->db_state, ==, DB_CACHED);
 
-	holds = refcount_count(&db->db_holds);
+	holds = zfs_refcount_count(&db->db_holds);
 	if (verify_type == DBVU_EVICTING) {
 		/*
 		 * Immediate eviction occurs when holds == dirtycnt.
@@ -447,7 +447,8 @@ dbuf_include_in_metadata_cache(dmu_buf_impl_t *db)
 		 * Sanity check for small-memory systems: don't allocate too
 		 * much memory for this purpose.
 		 */
-		if (refcount_count(&dbuf_caches[DB_DBUF_METADATA_CACHE].size) >
+		if (zfs_refcount_count(
+		    &dbuf_caches[DB_DBUF_METADATA_CACHE].size) >
 		    dbuf_metadata_cache_max_bytes) {
 			dbuf_metadata_cache_overflow++;
 			DTRACE_PROBE1(dbuf__metadata__cache__overflow,
@@ -496,7 +497,7 @@ dbuf_cache_above_hiwater(void)
 	uint64_t dbuf_cache_hiwater_bytes =
 	    (dbuf_cache_max_bytes * dbuf_cache_hiwater_pct) / 100;
 
-	return (refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) >
+	return (zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) >
 	    dbuf_cache_max_bytes + dbuf_cache_hiwater_bytes);
 }
 
@@ -506,7 +507,7 @@ dbuf_cache_above_lowater(void)
 	uint64_t dbuf_cache_lowater_bytes =
 	    (dbuf_cache_max_bytes * dbuf_cache_lowater_pct) / 100;
 
-	return (refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) >
+	return (zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) >
 	    dbuf_cache_max_bytes - dbuf_cache_lowater_bytes);
 }
 
@@ -533,7 +534,8 @@ dbuf_evict_one(void)
 	if (db != NULL) {
 		multilist_sublist_remove(mls, db);
 		multilist_sublist_unlock(mls);
-		(void) refcount_remove_many(&dbuf_caches[DB_DBUF_CACHE].size,
+		(void) zfs_refcount_remove_many(
+		    &dbuf_caches[DB_DBUF_CACHE].size,
 		    db->db.db_size, db);
 		ASSERT3U(db->db_caching_status, ==, DB_DBUF_CACHE);
 		db->db_caching_status = DB_NO_CACHE;
@@ -599,7 +601,7 @@ dbuf_evict_notify(void)
 	 * because it's OK to occasionally make the wrong decision here,
 	 * and grabbing the lock results in massive lock contention.
 	 */
-	if (refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) >
+	if (zfs_refcount_count(&dbuf_caches[DB_DBUF_CACHE].size) >
 	    dbuf_cache_max_bytes) {
 		if (dbuf_cache_above_hiwater())
 			dbuf_evict_one();
@@ -667,7 +669,7 @@ retry:
 		    multilist_create(sizeof (dmu_buf_impl_t),
 		    offsetof(dmu_buf_impl_t, db_cache_link),
 		    dbuf_cache_multilist_index_func);
-		refcount_create(&dbuf_caches[dcs].size);
+		zfs_refcount_create(&dbuf_caches[dcs].size);
 	}
 
 	dbuf_evict_thread_exit = B_FALSE;
@@ -701,7 +703,7 @@ dbuf_fini(void)
 	cv_destroy(&dbuf_evict_cv);
 
 	for (dbuf_cached_state_t dcs = 0; dcs < DB_CACHE_MAX; dcs++) {
-		refcount_destroy(&dbuf_caches[dcs].size);
+		zfs_refcount_destroy(&dbuf_caches[dcs].size);
 		multilist_destroy(dbuf_caches[dcs].cache);
 	}
 }
@@ -887,7 +889,7 @@ dbuf_loan_arcbuf(dmu_buf_impl_t *db)
 
 	ASSERT(db->db_blkid != DMU_BONUS_BLKID);
 	mutex_enter(&db->db_mtx);
-	if (arc_released(db->db_buf) || refcount_count(&db->db_holds) > 1) {
+	if (arc_released(db->db_buf) || zfs_refcount_count(&db->db_holds) > 1) {
 		int blksz = db->db.db_size;
 		spa_t *spa = db->db_objset->os_spa;
 
@@ -949,7 +951,7 @@ dbuf_read_done(zio_t *zio, arc_buf_t *buf, void *vdb)
 	/*
 	 * All reads are synchronous, so we must have a hold on the dbuf
 	 */
-	ASSERT(refcount_count(&db->db_holds) > 0);
+	ASSERT(zfs_refcount_count(&db->db_holds) > 0);
 	ASSERT(db->db_buf == NULL);
 	ASSERT(db->db.db_data == NULL);
 	if (buf == NULL) {
@@ -986,7 +988,7 @@ dbuf_read_impl(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags)
 
 	DB_DNODE_ENTER(db);
 	dn = DB_DNODE(db);
-	ASSERT(!refcount_is_zero(&db->db_holds));
+	ASSERT(!zfs_refcount_is_zero(&db->db_holds));
 	/* We need the struct_rwlock to prevent db_blkptr from changing. */
 	ASSERT(RW_LOCK_HELD(&dn->dn_struct_rwlock));
 	ASSERT(MUTEX_HELD(&db->db_mtx));
@@ -1126,7 +1128,7 @@ dbuf_fix_old_data(dmu_buf_impl_t *db, uint64_t txg)
 		dr->dt.dl.dr_data = zio_buf_alloc(bonuslen);
 		arc_space_consume(bonuslen, ARC_SPACE_BONUS);
 		bcopy(db->db.db_data, dr->dt.dl.dr_data, bonuslen);
-	} else if (refcount_count(&db->db_holds) > db->db_dirtycnt) {
+	} else if (zfs_refcount_count(&db->db_holds) > db->db_dirtycnt) {
 		int size = arc_buf_size(db->db_buf);
 		arc_buf_contents_t type = DBUF_GET_BUFC_TYPE(db);
 		spa_t *spa = db->db_objset->os_spa;
@@ -1158,7 +1160,7 @@ dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags)
 	 * We don't have to hold the mutex to check db_state because it
 	 * can't be freed while we have a hold on the buffer.
 	 */
-	ASSERT(!refcount_is_zero(&db->db_holds));
+	ASSERT(!zfs_refcount_is_zero(&db->db_holds));
 
 	if (db->db_state == DB_NOFILL)
 		return (SET_ERROR(EIO));
@@ -1253,7 +1255,7 @@ dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags)
 static void
 dbuf_noread(dmu_buf_impl_t *db)
 {
-	ASSERT(!refcount_is_zero(&db->db_holds));
+	ASSERT(!zfs_refcount_is_zero(&db->db_holds));
 	ASSERT(db->db_blkid != DMU_BONUS_BLKID);
 	mutex_enter(&db->db_mtx);
 	while (db->db_state == DB_READ || db->db_state == DB_FILL)
@@ -1372,7 +1374,7 @@ dbuf_free_range(dnode_t *dn, uint64_t start_blkid, uint64_t end_blkid,
 			mutex_exit(&db->db_mtx);
 			continue;
 		}
-		if (refcount_count(&db->db_holds) == 0) {
+		if (zfs_refcount_count(&db->db_holds) == 0) {
 			ASSERT(db->db_buf);
 			dbuf_destroy(db);
 			continue;
@@ -1517,7 +1519,7 @@ dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx)
 	int txgoff = tx->tx_txg & TXG_MASK;
 
 	ASSERT(tx->tx_txg != 0);
-	ASSERT(!refcount_is_zero(&db->db_holds));
+	ASSERT(!zfs_refcount_is_zero(&db->db_holds));
 	DMU_TX_DIRTY_BUF(tx, db);
 
 	DB_DNODE_ENTER(db);
@@ -1881,7 +1883,7 @@ dbuf_undirty(dmu_buf_impl_t *db, dmu_tx_t *tx)
 	ASSERT(db->db_dirtycnt > 0);
 	db->db_dirtycnt -= 1;
 
-	if (refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) {
+	if (zfs_refcount_remove(&db->db_holds, (void *)(uintptr_t)txg) == 0) {
 		ASSERT(db->db_state == DB_NOFILL || arc_released(db->db_buf));
 		dbuf_destroy(db);
 		return (B_TRUE);
@@ -1897,7 +1899,7 @@ dmu_buf_will_dirty(dmu_buf_t *db_fake, dmu_tx_t *tx)
 	int rf = DB_RF_MUST_SUCCEED | DB_RF_NOPREFETCH;
 
 	ASSERT(tx->tx_txg != 0);
-	ASSERT(!refcount_is_zero(&db->db_holds));
+	ASSERT(!zfs_refcount_is_zero(&db->db_holds));
 
 	/*
 	 * Quick check for dirtyness.  For already dirty blocks, this
@@ -1949,7 +1951,7 @@ dmu_buf_will_fill(dmu_buf_t *db_fake, dmu_tx_t *tx)
 	ASSERT(db->db_blkid != DMU_BONUS_BLKID);
 	ASSERT(tx->tx_txg != 0);
 	ASSERT(db->db_level == 0);
-	ASSERT(!refcount_is_zero(&db->db_holds));
+	ASSERT(!zfs_refcount_is_zero(&db->db_holds));
 
 	ASSERT(db->db.db_object != DMU_META_DNODE_OBJECT ||
 	    dmu_tx_private_ok(tx));
@@ -2024,7 +2026,7 @@ dmu_buf_write_embedded(dmu_buf_t *dbuf, void *data,
 void
 dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx)
 {
-	ASSERT(!refcount_is_zero(&db->db_holds));
+	ASSERT(!zfs_refcount_is_zero(&db->db_holds));
 	ASSERT(db->db_blkid != DMU_BONUS_BLKID);
 	ASSERT(db->db_level == 0);
 	ASSERT3U(dbuf_is_metadata(db), ==, arc_is_metadata(buf));
@@ -2043,7 +2045,7 @@ dbuf_assign_arcbuf(dmu_buf_impl_t *db, arc_buf_t *buf, dmu_tx_t *tx)
 	ASSERT(db->db_state == DB_CACHED || db->db_state == DB_UNCACHED);
 
 	if (db->db_state == DB_CACHED &&
-	    refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) {
+	    zfs_refcount_count(&db->db_holds) - 1 > db->db_dirtycnt) {
 		mutex_exit(&db->db_mtx);
 		(void) dbuf_dirty(db, tx);
 		bcopy(buf->b_data, db->db.db_data, db->db.db_size);
@@ -2088,7 +2090,7 @@ dbuf_destroy(dmu_buf_impl_t *db)
 	dmu_buf_impl_t *dndb;
 
 	ASSERT(MUTEX_HELD(&db->db_mtx));
-	ASSERT(refcount_is_zero(&db->db_holds));
+	ASSERT(zfs_refcount_is_zero(&db->db_holds));
 
 	if (db->db_buf != NULL) {
 		arc_buf_destroy(db->db_buf, db);
@@ -2112,7 +2114,7 @@ dbuf_destroy(dmu_buf_impl_t *db)
 		    db->db_caching_status == DB_DBUF_METADATA_CACHE);
 
 		multilist_remove(dbuf_caches[db->db_caching_status].cache, db);
-		(void) refcount_remove_many(
+		(void) zfs_refcount_remove_many(
 		    &dbuf_caches[db->db_caching_status].size,
 		    db->db.db_size, db);
 
@@ -2162,7 +2164,7 @@ dbuf_destroy(dmu_buf_impl_t *db)
 		DB_DNODE_EXIT(db);
 	}
 
-	ASSERT(refcount_is_zero(&db->db_holds));
+	ASSERT(zfs_refcount_is_zero(&db->db_holds));
 
 	db->db_parent = NULL;
 
@@ -2353,8 +2355,8 @@ dbuf_create(dnode_t *dn, uint8_t level, uint64_t blkid,
 		dbuf_add_ref(parent, db);
 
 	ASSERT(dn->dn_object == DMU_META_DNODE_OBJECT ||
-	    refcount_count(&dn->dn_holds) > 0);
-	(void) refcount_add(&dn->dn_holds, db);
+	    zfs_refcount_count(&dn->dn_holds) > 0);
+	(void) zfs_refcount_add(&dn->dn_holds, db);
 	atomic_inc_32(&dn->dn_dbufs_count);
 
 	dprintf_dbuf(db, "db=%p\n", db);
@@ -2686,18 +2688,18 @@ top:
 	}
 
 	if (multilist_link_active(&db->db_cache_link)) {
-		ASSERT(refcount_is_zero(&db->db_holds));
+		ASSERT(zfs_refcount_is_zero(&db->db_holds));
 		ASSERT(db->db_caching_status == DB_DBUF_CACHE ||
 		    db->db_caching_status == DB_DBUF_METADATA_CACHE);
 
 		multilist_remove(dbuf_caches[db->db_caching_status].cache, db);
-		(void) refcount_remove_many(
+		(void) zfs_refcount_remove_many(
 		    &dbuf_caches[db->db_caching_status].size,
 		    db->db.db_size, db);
 
 		db->db_caching_status = DB_NO_CACHE;
 	}
-	(void) refcount_add(&db->db_holds, tag);
+	(void) zfs_refcount_add(&db->db_holds, tag);
 	DBUF_VERIFY(db);
 	mutex_exit(&db->db_mtx);
 
@@ -2769,7 +2771,7 @@ dbuf_rm_spill(dnode_t *dn, dmu_tx_t *tx)
 void
 dbuf_add_ref(dmu_buf_impl_t *db, void *tag)
 {
-	int64_t holds = refcount_add(&db->db_holds, tag);
+	int64_t holds = zfs_refcount_add(&db->db_holds, tag);
 	ASSERT3S(holds, >, 1);
 }
 
@@ -2789,7 +2791,7 @@ dbuf_try_add_ref(dmu_buf_t *db_fake, objset_t *os, uint64_t obj, uint64_t blkid,
 
 	if (found_db != NULL) {
 		if (db == found_db && dbuf_refcount(db) > db->db_dirtycnt) {
-			(void) refcount_add(&db->db_holds, tag);
+			(void) zfs_refcount_add(&db->db_holds, tag);
 			result = B_TRUE;
 		}
 		mutex_exit(&db->db_mtx);
@@ -2843,7 +2845,7 @@ dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag, boolean_t evicting)
 	 * dnode so we can guarantee in dnode_move() that a referenced bonus
 	 * buffer has a corresponding dnode hold.
 	 */
-	holds = refcount_remove(&db->db_holds, tag);
+	holds = zfs_refcount_remove(&db->db_holds, tag);
 	ASSERT(holds >= 0);
 
 	/*
@@ -2930,8 +2932,8 @@ dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag, boolean_t evicting)
 				db->db_caching_status = dcs;
 
 				multilist_insert(dbuf_caches[dcs].cache, db);
-				(void) refcount_add_many(&dbuf_caches[dcs].size,
-				    db->db.db_size, db);
+				(void) zfs_refcount_add_many(
+				    &dbuf_caches[dcs].size, db->db.db_size, db);
 				mutex_exit(&db->db_mtx);
 
 				if (db->db_caching_status == DB_DBUF_CACHE &&
@@ -2953,7 +2955,7 @@ dbuf_rele_and_unlock(dmu_buf_impl_t *db, void *tag, boolean_t evicting)
 uint64_t
 dbuf_refcount(dmu_buf_impl_t *db)
 {
-	return (refcount_count(&db->db_holds));
+	return (zfs_refcount_count(&db->db_holds));
 }
 
 void *
@@ -3228,7 +3230,7 @@ dbuf_sync_leaf(dbuf_dirty_record_t *dr, dmu_tx_t *tx)
 
 	if (db->db_state != DB_NOFILL &&
 	    dn->dn_object != DMU_META_DNODE_OBJECT &&
-	    refcount_count(&db->db_holds) > 1 &&
+	    zfs_refcount_count(&db->db_holds) > 1 &&
 	    dr->dt.dl.dr_override_state != DR_OVERRIDDEN &&
 	    *datap == db->db_buf) {
 		/*
diff --git a/usr/src/uts/common/fs/zfs/dmu.c b/usr/src/uts/common/fs/zfs/dmu.c
index af7c58bb8d..da84226c14 100644
--- a/usr/src/uts/common/fs/zfs/dmu.c
+++ b/usr/src/uts/common/fs/zfs/dmu.c
@@ -357,7 +357,7 @@ dmu_bonus_hold(objset_t *os, uint64_t object, void *tag, dmu_buf_t **dbp)
 	db = dn->dn_bonus;
 
 	/* as long as the bonus buf is held, the dnode will be held */
-	if (refcount_add(&db->db_holds, tag) == 1) {
+	if (zfs_refcount_add(&db->db_holds, tag) == 1) {
 		VERIFY(dnode_add_ref(dn, db));
 		atomic_inc_32(&dn->dn_dbufs_count);
 	}
diff --git a/usr/src/uts/common/fs/zfs/dmu_tx.c b/usr/src/uts/common/fs/zfs/dmu_tx.c
index 7cf7c7e4fd..6cb39d61a5 100644
--- a/usr/src/uts/common/fs/zfs/dmu_tx.c
+++ b/usr/src/uts/common/fs/zfs/dmu_tx.c
@@ -99,7 +99,7 @@ dmu_tx_hold_dnode_impl(dmu_tx_t *tx, dnode_t *dn, enum dmu_tx_hold_type type,
 	dmu_tx_hold_t *txh;
 
 	if (dn != NULL) {
-		(void) refcount_add(&dn->dn_holds, tx);
+		(void) zfs_refcount_add(&dn->dn_holds, tx);
 		if (tx->tx_txg != 0) {
 			mutex_enter(&dn->dn_mtx);
 			/*
@@ -109,7 +109,7 @@ dmu_tx_hold_dnode_impl(dmu_tx_t *tx, dnode_t *dn, enum dmu_tx_hold_type type,
 			 */
 			ASSERT(dn->dn_assigned_txg == 0);
 			dn->dn_assigned_txg = tx->tx_txg;
-			(void) refcount_add(&dn->dn_tx_holds, tx);
+			(void) zfs_refcount_add(&dn->dn_tx_holds, tx);
 			mutex_exit(&dn->dn_mtx);
 		}
 	}
@@ -117,8 +117,8 @@ dmu_tx_hold_dnode_impl(dmu_tx_t *tx, dnode_t *dn, enum dmu_tx_hold_type type,
 	txh = kmem_zalloc(sizeof (dmu_tx_hold_t), KM_SLEEP);
 	txh->txh_tx = tx;
 	txh->txh_dnode = dn;
-	refcount_create(&txh->txh_space_towrite);
-	refcount_create(&txh->txh_memory_tohold);
+	zfs_refcount_create(&txh->txh_space_towrite);
+	zfs_refcount_create(&txh->txh_memory_tohold);
 	txh->txh_type = type;
 	txh->txh_arg1 = arg1;
 	txh->txh_arg2 = arg2;
@@ -215,9 +215,9 @@ dmu_tx_count_write(dmu_tx_hold_t *txh, uint64_t off, uint64_t len)
 
 	zfs_zone_io_throttle(ZFS_ZONE_IOP_LOGICAL_WRITE);
 
-	(void) refcount_add_many(&txh->txh_space_towrite, len, FTAG);
+	(void) zfs_refcount_add_many(&txh->txh_space_towrite, len, FTAG);
 
-	if (refcount_count(&txh->txh_space_towrite) > 2 * DMU_MAX_ACCESS)
+	if (zfs_refcount_count(&txh->txh_space_towrite) > 2 * DMU_MAX_ACCESS)
 		err = SET_ERROR(EFBIG);
 
 	if (dn == NULL)
@@ -282,7 +282,8 @@ dmu_tx_count_write(dmu_tx_hold_t *txh, uint64_t off, uint64_t len)
 static void
 dmu_tx_count_dnode(dmu_tx_hold_t *txh)
 {
-	(void) refcount_add_many(&txh->txh_space_towrite, DNODE_MIN_SIZE, FTAG);
+	(void) zfs_refcount_add_many(&txh->txh_space_towrite, DNODE_MIN_SIZE,
+	    FTAG);
 }
 
 void
@@ -314,7 +315,7 @@ dmu_tx_hold_remap_l1indirect(dmu_tx_t *tx, uint64_t object)
 		return;
 
 	dnode_t *dn = txh->txh_dnode;
-	(void) refcount_add_many(&txh->txh_space_towrite,
+	(void) zfs_refcount_add_many(&txh->txh_space_towrite,
 	    1ULL << dn->dn_indblkshift, FTAG);
 	dmu_tx_count_dnode(txh);
 }
@@ -421,7 +422,7 @@ dmu_tx_hold_free_impl(dmu_tx_hold_t *txh, uint64_t off, uint64_t len)
 				return;
 			}
 
-			(void) refcount_add_many(&txh->txh_memory_tohold,
+			(void) zfs_refcount_add_many(&txh->txh_memory_tohold,
 			    1 << dn->dn_indblkshift, FTAG);
 
 			err = dmu_tx_check_ioerr(zio, dn, 1, i);
@@ -482,7 +483,7 @@ dmu_tx_hold_zap_impl(dmu_tx_hold_t *txh, const char *name)
 	 *    - 2 blocks for possibly split leaves,
 	 *    - 2 grown ptrtbl blocks
 	 */
-	(void) refcount_add_many(&txh->txh_space_towrite,
+	(void) zfs_refcount_add_many(&txh->txh_space_towrite,
 	    MZAP_MAX_BLKSZ, FTAG);
 
 	if (dn == NULL)
@@ -572,7 +573,7 @@ dmu_tx_hold_space(dmu_tx_t *tx, uint64_t space)
 	txh = dmu_tx_hold_object_impl(tx, tx->tx_objset,
 	    DMU_NEW_OBJECT, THT_SPACE, space, 0);
 
-	(void) refcount_add_many(&txh->txh_space_towrite, space, FTAG);
+	(void) zfs_refcount_add_many(&txh->txh_space_towrite, space, FTAG);
 }
 
 #ifdef ZFS_DEBUG
@@ -927,11 +928,11 @@ dmu_tx_try_assign(dmu_tx_t *tx, uint64_t txg_how)
 			if (dn->dn_assigned_txg == 0)
 				dn->dn_assigned_txg = tx->tx_txg;
 			ASSERT3U(dn->dn_assigned_txg, ==, tx->tx_txg);
-			(void) refcount_add(&dn->dn_tx_holds, tx);
+			(void) zfs_refcount_add(&dn->dn_tx_holds, tx);
 			mutex_exit(&dn->dn_mtx);
 		}
-		towrite += refcount_count(&txh->txh_space_towrite);
-		tohold += refcount_count(&txh->txh_memory_tohold);
+		towrite += zfs_refcount_count(&txh->txh_space_towrite);
+		tohold += zfs_refcount_count(&txh->txh_memory_tohold);
 	}
 
 	/* needed allocation: worst-case estimate of write space */
@@ -971,7 +972,7 @@ dmu_tx_unassign(dmu_tx_t *tx)
 		mutex_enter(&dn->dn_mtx);
 		ASSERT3U(dn->dn_assigned_txg, ==, tx->tx_txg);
 
-		if (refcount_remove(&dn->dn_tx_holds, tx) == 0) {
+		if (zfs_refcount_remove(&dn->dn_tx_holds, tx) == 0) {
 			dn->dn_assigned_txg = 0;
 			cv_broadcast(&dn->dn_notxholds);
 		}
@@ -1105,10 +1106,10 @@ dmu_tx_destroy(dmu_tx_t *tx)
 		dnode_t *dn = txh->txh_dnode;
 
 		list_remove(&tx->tx_holds, txh);
-		refcount_destroy_many(&txh->txh_space_towrite,
-		    refcount_count(&txh->txh_space_towrite));
-		refcount_destroy_many(&txh->txh_memory_tohold,
-		    refcount_count(&txh->txh_memory_tohold));
+		zfs_refcount_destroy_many(&txh->txh_space_towrite,
+		    zfs_refcount_count(&txh->txh_space_towrite));
+		zfs_refcount_destroy_many(&txh->txh_memory_tohold,
+		    zfs_refcount_count(&txh->txh_memory_tohold));
 		kmem_free(txh, sizeof (dmu_tx_hold_t));
 		if (dn != NULL)
 			dnode_rele(dn, tx);
@@ -1138,7 +1139,7 @@ dmu_tx_commit(dmu_tx_t *tx)
 		mutex_enter(&dn->dn_mtx);
 		ASSERT3U(dn->dn_assigned_txg, ==, tx->tx_txg);
 
-		if (refcount_remove(&dn->dn_tx_holds, tx) == 0) {
+		if (zfs_refcount_remove(&dn->dn_tx_holds, tx) == 0) {
 			dn->dn_assigned_txg = 0;
 			cv_broadcast(&dn->dn_notxholds);
 		}
@@ -1253,7 +1254,7 @@ dmu_tx_hold_spill(dmu_tx_t *tx, uint64_t object)
 	txh = dmu_tx_hold_object_impl(tx, tx->tx_objset, object,
 	    THT_SPILL, 0, 0);
 	if (txh != NULL)
-		(void) refcount_add_many(&txh->txh_space_towrite,
+		(void) zfs_refcount_add_many(&txh->txh_space_towrite,
 		    SPA_OLD_MAXBLOCKSIZE, FTAG);
 }
 
diff --git a/usr/src/uts/common/fs/zfs/dnode.c b/usr/src/uts/common/fs/zfs/dnode.c
index 1305a4f64a..972aebf45c 100644
--- a/usr/src/uts/common/fs/zfs/dnode.c
+++ b/usr/src/uts/common/fs/zfs/dnode.c
@@ -137,8 +137,8 @@ dnode_cons(void *arg, void *unused, int kmflag)
 	 * Every dbuf has a reference, and dropping a tracked reference is
 	 * O(number of references), so don't track dn_holds.
 	 */
-	refcount_create_untracked(&dn->dn_holds);
-	refcount_create(&dn->dn_tx_holds);
+	zfs_refcount_create_untracked(&dn->dn_holds);
+	zfs_refcount_create(&dn->dn_tx_holds);
 	list_link_init(&dn->dn_link);
 
 	bzero(&dn->dn_next_nblkptr[0], sizeof (dn->dn_next_nblkptr));
@@ -192,8 +192,8 @@ dnode_dest(void *arg, void *unused)
 	mutex_destroy(&dn->dn_mtx);
 	mutex_destroy(&dn->dn_dbufs_mtx);
 	cv_destroy(&dn->dn_notxholds);
-	refcount_destroy(&dn->dn_holds);
-	refcount_destroy(&dn->dn_tx_holds);
+	zfs_refcount_destroy(&dn->dn_holds);
+	zfs_refcount_destroy(&dn->dn_tx_holds);
 	ASSERT(!list_link_active(&dn->dn_link));
 
 	for (i = 0; i < TXG_SIZE; i++) {
@@ -393,7 +393,7 @@ dnode_buf_byteswap(void *vbuf, size_t size)
 void
 dnode_setbonuslen(dnode_t *dn, int newsize, dmu_tx_t *tx)
 {
-	ASSERT3U(refcount_count(&dn->dn_holds), >=, 1);
+	ASSERT3U(zfs_refcount_count(&dn->dn_holds), >=, 1);
 
 	dnode_setdirty(dn, tx);
 	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
@@ -410,7 +410,7 @@ dnode_setbonuslen(dnode_t *dn, int newsize, dmu_tx_t *tx)
 void
 dnode_setbonus_type(dnode_t *dn, dmu_object_type_t newtype, dmu_tx_t *tx)
 {
-	ASSERT3U(refcount_count(&dn->dn_holds), >=, 1);
+	ASSERT3U(zfs_refcount_count(&dn->dn_holds), >=, 1);
 	dnode_setdirty(dn, tx);
 	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
 	dn->dn_bonustype = newtype;
@@ -421,7 +421,7 @@ dnode_setbonus_type(dnode_t *dn, dmu_object_type_t newtype, dmu_tx_t *tx)
 void
 dnode_rm_spill(dnode_t *dn, dmu_tx_t *tx)
 {
-	ASSERT3U(refcount_count(&dn->dn_holds), >=, 1);
+	ASSERT3U(zfs_refcount_count(&dn->dn_holds), >=, 1);
 	ASSERT(RW_WRITE_HELD(&dn->dn_struct_rwlock));
 	dnode_setdirty(dn, tx);
 	dn->dn_rm_spillblk[tx->tx_txg&TXG_MASK] = DN_KILL_SPILLBLK;
@@ -613,8 +613,8 @@ dnode_allocate(dnode_t *dn, dmu_object_type_t ot, int blocksize, int ibs,
 	ASSERT0(dn->dn_maxblkid);
 	ASSERT0(dn->dn_allocated_txg);
 	ASSERT0(dn->dn_assigned_txg);
-	ASSERT(refcount_is_zero(&dn->dn_tx_holds));
-	ASSERT3U(refcount_count(&dn->dn_holds), <=, 1);
+	ASSERT(zfs_refcount_is_zero(&dn->dn_tx_holds));
+	ASSERT3U(zfs_refcount_count(&dn->dn_holds), <=, 1);
 	ASSERT(avl_is_empty(&dn->dn_dbufs));
 
 	for (i = 0; i < TXG_SIZE; i++) {
@@ -805,8 +805,8 @@ dnode_move_impl(dnode_t *odn, dnode_t *ndn)
 	ndn->dn_assigned_txg = odn->dn_assigned_txg;
 	ndn->dn_dirtyctx = odn->dn_dirtyctx;
 	ndn->dn_dirtyctx_firstset = odn->dn_dirtyctx_firstset;
-	ASSERT(refcount_count(&odn->dn_tx_holds) == 0);
-	refcount_transfer(&ndn->dn_holds, &odn->dn_holds);
+	ASSERT(zfs_refcount_count(&odn->dn_tx_holds) == 0);
+	zfs_refcount_transfer(&ndn->dn_holds, &odn->dn_holds);
 	ASSERT(avl_is_empty(&ndn->dn_dbufs));
 	avl_swap(&ndn->dn_dbufs, &odn->dn_dbufs);
 	ndn->dn_dbufs_count = odn->dn_dbufs_count;
@@ -993,7 +993,7 @@ dnode_move(void *buf, void *newbuf, size_t size, void *arg)
 	 * hold before the dbuf is removed, the hold is discounted, and the
 	 * removal is blocked until the move completes.
 	 */
-	refcount = refcount_count(&odn->dn_holds);
+	refcount = zfs_refcount_count(&odn->dn_holds);
 	ASSERT(refcount >= 0);
 	dbufs = odn->dn_dbufs_count;
 
@@ -1021,7 +1021,7 @@ dnode_move(void *buf, void *newbuf, size_t size, void *arg)
 
 	list_link_replace(&odn->dn_link, &ndn->dn_link);
 	/* If the dnode was safe to move, the refcount cannot have changed. */
-	ASSERT(refcount == refcount_count(&ndn->dn_holds));
+	ASSERT(refcount == zfs_refcount_count(&ndn->dn_holds));
 	ASSERT(dbufs == ndn->dn_dbufs_count);
 	zrl_exit(&ndn->dn_handle->dnh_zrlock); /* handle has moved */
 	mutex_exit(&os->os_lock);
@@ -1167,7 +1167,7 @@ dnode_special_close(dnode_handle_t *dnh)
 	 * has a hold on this dnode while we are trying to evict this
 	 * dnode.
 	 */
-	while (refcount_count(&dn->dn_holds) > 0)
+	while (zfs_refcount_count(&dn->dn_holds) > 0)
 		delay(1);
 	ASSERT(dn->dn_dbuf == NULL ||
 	    dmu_buf_get_user(&dn->dn_dbuf->db) == NULL);
@@ -1222,8 +1222,8 @@ dnode_buf_evict_async(void *dbu)
 		 * it wouldn't be eligible for eviction and this function
 		 * would not have been called.
 		 */
-		ASSERT(refcount_is_zero(&dn->dn_holds));
-		ASSERT(refcount_is_zero(&dn->dn_tx_holds));
+		ASSERT(zfs_refcount_is_zero(&dn->dn_holds));
+		ASSERT(zfs_refcount_is_zero(&dn->dn_tx_holds));
 
 		dnode_destroy(dn); /* implicit zrl_remove() for first slot */
 		zrl_destroy(&dnh->dnh_zrlock);
@@ -1297,7 +1297,7 @@ dnode_hold_impl(objset_t *os, uint64_t object, int flag, int slots,
 		if ((flag & DNODE_MUST_BE_FREE) && type != DMU_OT_NONE)
 			return (SET_ERROR(EEXIST));
 		DNODE_VERIFY(dn);
-		(void) refcount_add(&dn->dn_holds, tag);
+		(void) zfs_refcount_add(&dn->dn_holds, tag);
 		*dnp = dn;
 		return (0);
 	}
@@ -1490,7 +1490,7 @@ dnode_hold_impl(objset_t *os, uint64_t object, int flag, int slots,
 		}
 
 		mutex_enter(&dn->dn_mtx);
-		if (!refcount_is_zero(&dn->dn_holds) || dn->dn_free_txg) {
+		if (!zfs_refcount_is_zero(&dn->dn_holds) || dn->dn_free_txg) {
 			DNODE_STAT_BUMP(dnode_hold_free_refcount);
 			mutex_exit(&dn->dn_mtx);
 			dnode_slots_rele(dnc, idx, slots);
@@ -1515,7 +1515,7 @@ dnode_hold_impl(objset_t *os, uint64_t object, int flag, int slots,
 		    ENOENT : EEXIST));
 	}
 
-	if (refcount_add(&dn->dn_holds, tag) == 1)
+	if (zfs_refcount_add(&dn->dn_holds, tag) == 1)
 		dbuf_add_ref(db, dnh);
 
 	mutex_exit(&dn->dn_mtx);
@@ -1551,11 +1551,11 @@ boolean_t
 dnode_add_ref(dnode_t *dn, void *tag)
 {
 	mutex_enter(&dn->dn_mtx);
-	if (refcount_is_zero(&dn->dn_holds)) {
+	if (zfs_refcount_is_zero(&dn->dn_holds)) {
 		mutex_exit(&dn->dn_mtx);
 		return (FALSE);
 	}
-	VERIFY(1 < refcount_add(&dn->dn_holds, tag));
+	VERIFY(1 < zfs_refcount_add(&dn->dn_holds, tag));
 	mutex_exit(&dn->dn_mtx);
 	return (TRUE);
 }
@@ -1575,7 +1575,7 @@ dnode_rele_and_unlock(dnode_t *dn, void *tag, boolean_t evicting)
 	dmu_buf_impl_t *db = dn->dn_dbuf;
 	dnode_handle_t *dnh = dn->dn_handle;
 
-	refs = refcount_remove(&dn->dn_holds, tag);
+	refs = zfs_refcount_remove(&dn->dn_holds, tag);
 	mutex_exit(&dn->dn_mtx);
 
 	/*
@@ -1640,7 +1640,7 @@ dnode_setdirty(dnode_t *dn, dmu_tx_t *tx)
 		return;
 	}
 
-	ASSERT(!refcount_is_zero(&dn->dn_holds) ||
+	ASSERT(!zfs_refcount_is_zero(&dn->dn_holds) ||
 	    !avl_is_empty(&dn->dn_dbufs));
 	ASSERT(dn->dn_datablksz != 0);
 	ASSERT0(dn->dn_next_bonuslen[txg&TXG_MASK]);
diff --git a/usr/src/uts/common/fs/zfs/dnode_sync.c b/usr/src/uts/common/fs/zfs/dnode_sync.c
index a37607e0e3..9283356608 100644
--- a/usr/src/uts/common/fs/zfs/dnode_sync.c
+++ b/usr/src/uts/common/fs/zfs/dnode_sync.c
@@ -432,7 +432,7 @@ dnode_evict_dbufs(dnode_t *dn)
 
 		mutex_enter(&db->db_mtx);
 		if (db->db_state != DB_EVICTING &&
-		    refcount_is_zero(&db->db_holds)) {
+		    zfs_refcount_is_zero(&db->db_holds)) {
 			db_marker.db_level = db->db_level;
 			db_marker.db_blkid = db->db_blkid;
 			db_marker.db_state = DB_SEARCH;
@@ -472,7 +472,7 @@ dnode_evict_bonus(dnode_t *dn)
 {
 	rw_enter(&dn->dn_struct_rwlock, RW_WRITER);
 	if (dn->dn_bonus != NULL) {
-		if (refcount_is_zero(&dn->dn_bonus->db_holds)) {
+		if (zfs_refcount_is_zero(&dn->dn_bonus->db_holds)) {
 			mutex_enter(&dn->dn_bonus->db_mtx);
 			dbuf_destroy(dn->dn_bonus);
 			dn->dn_bonus = NULL;
@@ -538,7 +538,7 @@ dnode_sync_free(dnode_t *dn, dmu_tx_t *tx)
 	 * zfs_obj_to_path() also depends on this being
 	 * commented out.
 	 *
-	 * ASSERT3U(refcount_count(&dn->dn_holds), ==, 1);
+	 * ASSERT3U(zfs_refcount_count(&dn->dn_holds), ==, 1);
 	 */
 
 	/* Undirty next bits */
diff --git a/usr/src/uts/common/fs/zfs/dsl_dataset.c b/usr/src/uts/common/fs/zfs/dsl_dataset.c
index 5428f94813..27873c0d45 100644
--- a/usr/src/uts/common/fs/zfs/dsl_dataset.c
+++ b/usr/src/uts/common/fs/zfs/dsl_dataset.c
@@ -336,7 +336,7 @@ dsl_dataset_evict_async(void *dbu)
 	mutex_destroy(&ds->ds_opening_lock);
 	mutex_destroy(&ds->ds_sendstream_lock);
 	mutex_destroy(&ds->ds_remap_deadlist_lock);
-	refcount_destroy(&ds->ds_longholds);
+	zfs_refcount_destroy(&ds->ds_longholds);
 	rrw_destroy(&ds->ds_bp_rwlock);
 
 	kmem_free(ds, sizeof (dsl_dataset_t));
@@ -474,7 +474,7 @@ dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
 		mutex_init(&ds->ds_remap_deadlist_lock,
 		    NULL, MUTEX_DEFAULT, NULL);
 		rrw_init(&ds->ds_bp_rwlock, B_FALSE);
-		refcount_create(&ds->ds_longholds);
+		zfs_refcount_create(&ds->ds_longholds);
 
 		bplist_create(&ds->ds_pending_deadlist);
 
@@ -565,7 +565,7 @@ dsl_dataset_hold_obj(dsl_pool_t *dp, uint64_t dsobj, void *tag,
 			mutex_destroy(&ds->ds_lock);
 			mutex_destroy(&ds->ds_opening_lock);
 			mutex_destroy(&ds->ds_sendstream_lock);
-			refcount_destroy(&ds->ds_longholds);
+			zfs_refcount_destroy(&ds->ds_longholds);
 			kmem_free(ds, sizeof (dsl_dataset_t));
 			if (err != 0) {
 				dmu_buf_rele(dbuf, tag);
@@ -690,20 +690,20 @@ void
 dsl_dataset_long_hold(dsl_dataset_t *ds, void *tag)
 {
 	ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
-	(void) refcount_add(&ds->ds_longholds, tag);
+	(void) zfs_refcount_add(&ds->ds_longholds, tag);
 }
 
 void
 dsl_dataset_long_rele(dsl_dataset_t *ds, void *tag)
 {
-	(void) refcount_remove(&ds->ds_longholds, tag);
+	(void) zfs_refcount_remove(&ds->ds_longholds, tag);
 }
 
 /* Return B_TRUE if there are any long holds on this dataset. */
 boolean_t
 dsl_dataset_long_held(dsl_dataset_t *ds)
 {
-	return (!refcount_is_zero(&ds->ds_longholds));
+	return (!zfs_refcount_is_zero(&ds->ds_longholds));
 }
 
 void
diff --git a/usr/src/uts/common/fs/zfs/dsl_destroy.c b/usr/src/uts/common/fs/zfs/dsl_destroy.c
index f4eb57dd12..59a946cca0 100644
--- a/usr/src/uts/common/fs/zfs/dsl_destroy.c
+++ b/usr/src/uts/common/fs/zfs/dsl_destroy.c
@@ -263,7 +263,7 @@ dsl_destroy_snapshot_sync_impl(dsl_dataset_t *ds, boolean_t defer, dmu_tx_t *tx)
 	rrw_enter(&ds->ds_bp_rwlock, RW_READER, FTAG);
 	ASSERT3U(dsl_dataset_phys(ds)->ds_bp.blk_birth, <=, tx->tx_txg);
 	rrw_exit(&ds->ds_bp_rwlock, FTAG);
-	ASSERT(refcount_is_zero(&ds->ds_longholds));
+	ASSERT(zfs_refcount_is_zero(&ds->ds_longholds));
 
 	if (defer &&
 	    (ds->ds_userrefs > 0 ||
@@ -697,7 +697,7 @@ dsl_destroy_head_check_impl(dsl_dataset_t *ds, int expected_holds)
 	if (ds->ds_is_snapshot)
 		return (SET_ERROR(EINVAL));
 
-	if (refcount_count(&ds->ds_longholds) != expected_holds)
+	if (zfs_refcount_count(&ds->ds_longholds) != expected_holds)
 		return (SET_ERROR(EBUSY));
 
 	mos = ds->ds_dir->dd_pool->dp_meta_objset;
@@ -725,7 +725,7 @@ dsl_destroy_head_check_impl(dsl_dataset_t *ds, int expected_holds)
 	    dsl_dataset_phys(ds->ds_prev)->ds_num_children == 2 &&
 	    ds->ds_prev->ds_userrefs == 0) {
 		/* We need to remove the origin snapshot as well. */
-		if (!refcount_is_zero(&ds->ds_prev->ds_longholds))
+		if (!zfs_refcount_is_zero(&ds->ds_prev->ds_longholds))
 			return (SET_ERROR(EBUSY));
 	}
 	return (0);
diff --git a/usr/src/uts/common/fs/zfs/metaslab.c b/usr/src/uts/common/fs/zfs/metaslab.c
index 92424eb48e..f652a3ef1a 100644
--- a/usr/src/uts/common/fs/zfs/metaslab.c
+++ b/usr/src/uts/common/fs/zfs/metaslab.c
@@ -251,11 +251,11 @@ metaslab_class_create(spa_t *spa, metaslab_ops_t *ops)
 	mc->mc_ops = ops;
 	mutex_init(&mc->mc_lock, NULL, MUTEX_DEFAULT, NULL);
 	mc->mc_alloc_slots = kmem_zalloc(spa->spa_alloc_count *
-	    sizeof (refcount_t), KM_SLEEP);
+	    sizeof (zfs_refcount_t), KM_SLEEP);
 	mc->mc_alloc_max_slots = kmem_zalloc(spa->spa_alloc_count *
 	    sizeof (uint64_t), KM_SLEEP);
 	for (int i = 0; i < spa->spa_alloc_count; i++)
-		refcount_create_tracked(&mc->mc_alloc_slots[i]);
+		zfs_refcount_create_tracked(&mc->mc_alloc_slots[i]);
 
 	return (mc);
 }
@@ -270,9 +270,9 @@ metaslab_class_destroy(metaslab_class_t *mc)
 	ASSERT(mc->mc_dspace == 0);
 
 	for (int i = 0; i < mc->mc_spa->spa_alloc_count; i++)
-		refcount_destroy(&mc->mc_alloc_slots[i]);
+		zfs_refcount_destroy(&mc->mc_alloc_slots[i]);
 	kmem_free(mc->mc_alloc_slots, mc->mc_spa->spa_alloc_count *
-	    sizeof (refcount_t));
+	    sizeof (zfs_refcount_t));
 	kmem_free(mc->mc_alloc_max_slots, mc->mc_spa->spa_alloc_count *
 	    sizeof (uint64_t));
 	mutex_destroy(&mc->mc_lock);
@@ -667,12 +667,12 @@ metaslab_group_create(metaslab_class_t *mc, vdev_t *vd, int allocators)
 	mg->mg_no_free_space = B_TRUE;
 	mg->mg_allocators = allocators;
 
-	mg->mg_alloc_queue_depth = kmem_zalloc(allocators * sizeof (refcount_t),
-	    KM_SLEEP);
+	mg->mg_alloc_queue_depth = kmem_zalloc(allocators *
+	    sizeof (zfs_refcount_t), KM_SLEEP);
 	mg->mg_cur_max_alloc_queue_depth = kmem_zalloc(allocators *
 	    sizeof (uint64_t), KM_SLEEP);
 	for (int i = 0; i < allocators; i++) {
-		refcount_create_tracked(&mg->mg_alloc_queue_depth[i]);
+		zfs_refcount_create_tracked(&mg->mg_alloc_queue_depth[i]);
 		mg->mg_cur_max_alloc_queue_depth[i] = 0;
 	}
 
@@ -704,11 +704,11 @@ metaslab_group_destroy(metaslab_group_t *mg)
 	cv_destroy(&mg->mg_ms_initialize_cv);
 
 	for (int i = 0; i < mg->mg_allocators; i++) {
-		refcount_destroy(&mg->mg_alloc_queue_depth[i]);
+		zfs_refcount_destroy(&mg->mg_alloc_queue_depth[i]);
 		mg->mg_cur_max_alloc_queue_depth[i] = 0;
 	}
 	kmem_free(mg->mg_alloc_queue_depth, mg->mg_allocators *
-	    sizeof (refcount_t));
+	    sizeof (zfs_refcount_t));
 	kmem_free(mg->mg_cur_max_alloc_queue_depth, mg->mg_allocators *
 	    sizeof (uint64_t));
 
@@ -1056,7 +1056,8 @@ metaslab_group_allocatable(metaslab_group_t *mg, metaslab_group_t *rotor,
 		if (mg->mg_no_free_space)
 			return (B_FALSE);
 
-		qdepth = refcount_count(&mg->mg_alloc_queue_depth[allocator]);
+		qdepth = zfs_refcount_count(
+		    &mg->mg_alloc_queue_depth[allocator]);
 
 		/*
 		 * If this metaslab group is below its qmax or it's
@@ -1077,7 +1078,7 @@ metaslab_group_allocatable(metaslab_group_t *mg, metaslab_group_t *rotor,
 		for (mgp = mg->mg_next; mgp != rotor; mgp = mgp->mg_next) {
 			qmax = mgp->mg_cur_max_alloc_queue_depth[allocator];
 
-			qdepth = refcount_count(
+			qdepth = zfs_refcount_count(
 			    &mgp->mg_alloc_queue_depth[allocator]);
 
 			/*
@@ -2959,7 +2960,7 @@ metaslab_group_alloc_increment(spa_t *spa, uint64_t vdev, void *tag, int flags,
 	if (!mg->mg_class->mc_alloc_throttle_enabled)
 		return;
 
-	(void) refcount_add(&mg->mg_alloc_queue_depth[allocator], tag);
+	(void) zfs_refcount_add(&mg->mg_alloc_queue_depth[allocator], tag);
 }
 
 static void
@@ -2990,7 +2991,7 @@ metaslab_group_alloc_decrement(spa_t *spa, uint64_t vdev, void *tag, int flags,
 	if (!mg->mg_class->mc_alloc_throttle_enabled)
 		return;
 
-	(void) refcount_remove(&mg->mg_alloc_queue_depth[allocator], tag);
+	(void) zfs_refcount_remove(&mg->mg_alloc_queue_depth[allocator], tag);
 	if (io_complete)
 		metaslab_group_increment_qdepth(mg, allocator);
 }
@@ -3006,8 +3007,8 @@ metaslab_group_alloc_verify(spa_t *spa, const blkptr_t *bp, void *tag,
 	for (int d = 0; d < ndvas; d++) {
 		uint64_t vdev = DVA_GET_VDEV(&dva[d]);
 		metaslab_group_t *mg = vdev_lookup_top(spa, vdev)->vdev_mg;
-		VERIFY(refcount_not_held(&mg->mg_alloc_queue_depth[allocator],
-		    tag));
+		VERIFY(zfs_refcount_not_held(
+		    &mg->mg_alloc_queue_depth[allocator], tag));
 	}
 #endif
 }
@@ -3889,7 +3890,7 @@ metaslab_class_throttle_reserve(metaslab_class_t *mc, int slots, int allocator,
 	mutex_enter(&mc->mc_lock);
 
 	uint64_t reserved_slots =
-	    refcount_count(&mc->mc_alloc_slots[allocator]);
+	    zfs_refcount_count(&mc->mc_alloc_slots[allocator]);
 	if (reserved_slots < max)
 		available_slots = max - reserved_slots;
 
@@ -3900,7 +3901,7 @@ metaslab_class_throttle_reserve(metaslab_class_t *mc, int slots, int allocator,
 		 */
 		for (int d = 0; d < slots; d++) {
 			reserved_slots =
-			    refcount_add(&mc->mc_alloc_slots[allocator],
+			    zfs_refcount_add(&mc->mc_alloc_slots[allocator],
 			    zio);
 		}
 		zio->io_flags |= ZIO_FLAG_IO_ALLOCATING;
@@ -3918,7 +3919,7 @@ metaslab_class_throttle_unreserve(metaslab_class_t *mc, int slots,
 	ASSERT(mc->mc_alloc_throttle_enabled);
 	mutex_enter(&mc->mc_lock);
 	for (int d = 0; d < slots; d++) {
-		(void) refcount_remove(&mc->mc_alloc_slots[allocator],
+		(void) zfs_refcount_remove(&mc->mc_alloc_slots[allocator],
 		    zio);
 	}
 	mutex_exit(&mc->mc_lock);
diff --git a/usr/src/uts/common/fs/zfs/refcount.c b/usr/src/uts/common/fs/zfs/refcount.c
index 8176cfd849..cac716e469 100644
--- a/usr/src/uts/common/fs/zfs/refcount.c
+++ b/usr/src/uts/common/fs/zfs/refcount.c
@@ -39,7 +39,7 @@ static kmem_cache_t *reference_cache;
 static kmem_cache_t *reference_history_cache;
 
 void
-refcount_init(void)
+zfs_refcount_init(void)
 {
 	reference_cache = kmem_cache_create("reference_cache",
 	    sizeof (reference_t), 0, NULL, NULL, NULL, NULL, NULL, 0);
@@ -49,14 +49,14 @@ refcount_init(void)
 }
 
 void
-refcount_fini(void)
+zfs_refcount_fini(void)
 {
 	kmem_cache_destroy(reference_cache);
 	kmem_cache_destroy(reference_history_cache);
 }
 
 void
-refcount_create(refcount_t *rc)
+zfs_refcount_create(zfs_refcount_t *rc)
 {
 	mutex_init(&rc->rc_mtx, NULL, MUTEX_DEFAULT, NULL);
 	list_create(&rc->rc_list, sizeof (reference_t),
@@ -69,21 +69,21 @@ refcount_create(refcount_t *rc)
 }
 
 void
-refcount_create_tracked(refcount_t *rc)
+zfs_refcount_create_tracked(zfs_refcount_t *rc)
 {
-	refcount_create(rc);
+	zfs_refcount_create(rc);
 	rc->rc_tracked = B_TRUE;
 }
 
 void
-refcount_create_untracked(refcount_t *rc)
+zfs_refcount_create_untracked(zfs_refcount_t *rc)
 {
-	refcount_create(rc);
+	zfs_refcount_create(rc);
 	rc->rc_tracked = B_FALSE;
 }
 
 void
-refcount_destroy_many(refcount_t *rc, uint64_t number)
+zfs_refcount_destroy_many(zfs_refcount_t *rc, uint64_t number)
 {
 	reference_t *ref;
 
@@ -104,25 +104,25 @@ refcount_destroy_many(refcount_t *rc, uint64_t number)
 }
 
 void
-refcount_destroy(refcount_t *rc)
+zfs_refcount_destroy(zfs_refcount_t *rc)
 {
-	refcount_destroy_many(rc, 0);
+	zfs_refcount_destroy_many(rc, 0);
 }
 
 int
-refcount_is_zero(refcount_t *rc)
+zfs_refcount_is_zero(zfs_refcount_t *rc)
 {
 	return (rc->rc_count == 0);
 }
 
 int64_t
-refcount_count(refcount_t *rc)
+zfs_refcount_count(zfs_refcount_t *rc)
 {
 	return (rc->rc_count);
 }
 
 int64_t
-refcount_add_many(refcount_t *rc, uint64_t number, void *holder)
+zfs_refcount_add_many(zfs_refcount_t *rc, uint64_t number, void *holder)
 {
 	reference_t *ref = NULL;
 	int64_t count;
@@ -144,13 +144,13 @@ refcount_add_many(refcount_t *rc, uint64_t number, void *holder)
 }
 
 int64_t
-refcount_add(refcount_t *rc, void *holder)
+zfs_refcount_add(zfs_refcount_t *rc, void *holder)
 {
-	return (refcount_add_many(rc, 1, holder));
+	return (zfs_refcount_add_many(rc, 1, holder));
 }
 
 int64_t
-refcount_remove_many(refcount_t *rc, uint64_t number, void *holder)
+zfs_refcount_remove_many(zfs_refcount_t *rc, uint64_t number, void *holder)
 {
 	reference_t *ref;
 	int64_t count;
@@ -198,13 +198,13 @@ refcount_remove_many(refcount_t *rc, uint64_t number, void *holder)
 }
 
 int64_t
-refcount_remove(refcount_t *rc, void *holder)
+zfs_refcount_remove(zfs_refcount_t *rc, void *holder)
 {
-	return (refcount_remove_many(rc, 1, holder));
+	return (zfs_refcount_remove_many(rc, 1, holder));
 }
 
 void
-refcount_transfer(refcount_t *dst, refcount_t *src)
+zfs_refcount_transfer(zfs_refcount_t *dst, zfs_refcount_t *src)
 {
 	int64_t count, removed_count;
 	list_t list, removed;
@@ -235,7 +235,7 @@ refcount_transfer(refcount_t *dst, refcount_t *src)
 }
 
 void
-refcount_transfer_ownership(refcount_t *rc, void *current_holder,
+zfs_refcount_transfer_ownership(zfs_refcount_t *rc, void *current_holder,
     void *new_holder)
 {
 	reference_t *ref;
@@ -265,7 +265,7 @@ refcount_transfer_ownership(refcount_t *rc, void *current_holder,
  * might be held.
  */
 boolean_t
-refcount_held(refcount_t *rc, void *holder)
+zfs_refcount_held(zfs_refcount_t *rc, void *holder)
 {
 	reference_t *ref;
 
@@ -293,7 +293,7 @@ refcount_held(refcount_t *rc, void *holder)
  * since the reference might not be held.
  */
 boolean_t
-refcount_not_held(refcount_t *rc, void *holder)
+zfs_refcount_not_held(zfs_refcount_t *rc, void *holder)
 {
 	reference_t *ref;
 
diff --git a/usr/src/uts/common/fs/zfs/rrwlock.c b/usr/src/uts/common/fs/zfs/rrwlock.c
index 51394c01c4..6e7456efb2 100644
--- a/usr/src/uts/common/fs/zfs/rrwlock.c
+++ b/usr/src/uts/common/fs/zfs/rrwlock.c
@@ -85,7 +85,7 @@ rrn_find(rrwlock_t *rrl)
 {
 	rrw_node_t *rn;
 
-	if (refcount_count(&rrl->rr_linked_rcount) == 0)
+	if (zfs_refcount_count(&rrl->rr_linked_rcount) == 0)
 		return (NULL);
 
 	for (rn = tsd_get(rrw_tsd_key); rn != NULL; rn = rn->rn_next) {
@@ -120,7 +120,7 @@ rrn_find_and_remove(rrwlock_t *rrl, void *tag)
 	rrw_node_t *rn;
 	rrw_node_t *prev = NULL;
 
-	if (refcount_count(&rrl->rr_linked_rcount) == 0)
+	if (zfs_refcount_count(&rrl->rr_linked_rcount) == 0)
 		return (B_FALSE);
 
 	for (rn = tsd_get(rrw_tsd_key); rn != NULL; rn = rn->rn_next) {
@@ -143,8 +143,8 @@ rrw_init(rrwlock_t *rrl, boolean_t track_all)
 	mutex_init(&rrl->rr_lock, NULL, MUTEX_DEFAULT, NULL);
 	cv_init(&rrl->rr_cv, NULL, CV_DEFAULT, NULL);
 	rrl->rr_writer = NULL;
-	refcount_create(&rrl->rr_anon_rcount);
-	refcount_create(&rrl->rr_linked_rcount);
+	zfs_refcount_create(&rrl->rr_anon_rcount);
+	zfs_refcount_create(&rrl->rr_linked_rcount);
 	rrl->rr_writer_wanted = B_FALSE;
 	rrl->rr_track_all = track_all;
 }
@@ -155,8 +155,8 @@ rrw_destroy(rrwlock_t *rrl)
 	mutex_destroy(&rrl->rr_lock);
 	cv_destroy(&rrl->rr_cv);
 	ASSERT(rrl->rr_writer == NULL);
-	refcount_destroy(&rrl->rr_anon_rcount);
-	refcount_destroy(&rrl->rr_linked_rcount);
+	zfs_refcount_destroy(&rrl->rr_anon_rcount);
+	zfs_refcount_destroy(&rrl->rr_linked_rcount);
 }
 
 static void
@@ -173,19 +173,19 @@ rrw_enter_read_impl(rrwlock_t *rrl, boolean_t prio, void *tag)
 	DTRACE_PROBE(zfs__rrwfastpath__rdmiss);
 #endif
 	ASSERT(rrl->rr_writer != curthread);
-	ASSERT(refcount_count(&rrl->rr_anon_rcount) >= 0);
+	ASSERT(zfs_refcount_count(&rrl->rr_anon_rcount) >= 0);
 
 	while (rrl->rr_writer != NULL || (rrl->rr_writer_wanted &&
-	    refcount_is_zero(&rrl->rr_anon_rcount) && !prio &&
+	    zfs_refcount_is_zero(&rrl->rr_anon_rcount) && !prio &&
 	    rrn_find(rrl) == NULL))
 		cv_wait(&rrl->rr_cv, &rrl->rr_lock);
 
 	if (rrl->rr_writer_wanted || rrl->rr_track_all) {
 		/* may or may not be a re-entrant enter */
 		rrn_add(rrl, tag);
-		(void) refcount_add(&rrl->rr_linked_rcount, tag);
+		(void) zfs_refcount_add(&rrl->rr_linked_rcount, tag);
 	} else {
-		(void) refcount_add(&rrl->rr_anon_rcount, tag);
+		(void) zfs_refcount_add(&rrl->rr_anon_rcount, tag);
 	}
 	ASSERT(rrl->rr_writer == NULL);
 	mutex_exit(&rrl->rr_lock);
@@ -216,8 +216,8 @@ rrw_enter_write(rrwlock_t *rrl)
 	mutex_enter(&rrl->rr_lock);
 	ASSERT(rrl->rr_writer != curthread);
 
-	while (refcount_count(&rrl->rr_anon_rcount) > 0 ||
-	    refcount_count(&rrl->rr_linked_rcount) > 0 ||
+	while (zfs_refcount_count(&rrl->rr_anon_rcount) > 0 ||
+	    zfs_refcount_count(&rrl->rr_linked_rcount) > 0 ||
 	    rrl->rr_writer != NULL) {
 		rrl->rr_writer_wanted = B_TRUE;
 		cv_wait(&rrl->rr_cv, &rrl->rr_lock);
@@ -250,24 +250,25 @@ rrw_exit(rrwlock_t *rrl, void *tag)
 	}
 	DTRACE_PROBE(zfs__rrwfastpath__exitmiss);
 #endif
-	ASSERT(!refcount_is_zero(&rrl->rr_anon_rcount) ||
-	    !refcount_is_zero(&rrl->rr_linked_rcount) ||
+	ASSERT(!zfs_refcount_is_zero(&rrl->rr_anon_rcount) ||
+	    !zfs_refcount_is_zero(&rrl->rr_linked_rcount) ||
 	    rrl->rr_writer != NULL);
 
 	if (rrl->rr_writer == NULL) {
 		int64_t count;
 		if (rrn_find_and_remove(rrl, tag)) {
-			count = refcount_remove(&rrl->rr_linked_rcount, tag);
+			count = zfs_refcount_remove(
+			    &rrl->rr_linked_rcount, tag);
 		} else {
 			ASSERT(!rrl->rr_track_all);
-			count = refcount_remove(&rrl->rr_anon_rcount, tag);
+			count = zfs_refcount_remove(&rrl->rr_anon_rcount, tag);
 		}
 		if (count == 0)
 			cv_broadcast(&rrl->rr_cv);
 	} else {
 		ASSERT(rrl->rr_writer == curthread);
-		ASSERT(refcount_is_zero(&rrl->rr_anon_rcount) &&
-		    refcount_is_zero(&rrl->rr_linked_rcount));
+		ASSERT(zfs_refcount_is_zero(&rrl->rr_anon_rcount) &&
+		    zfs_refcount_is_zero(&rrl->rr_linked_rcount));
 		rrl->rr_writer = NULL;
 		cv_broadcast(&rrl->rr_cv);
 	}
@@ -288,7 +289,7 @@ rrw_held(rrwlock_t *rrl, krw_t rw)
 	if (rw == RW_WRITER) {
 		held = (rrl->rr_writer == curthread);
 	} else {
-		held = (!refcount_is_zero(&rrl->rr_anon_rcount) ||
+		held = (!zfs_refcount_is_zero(&rrl->rr_anon_rcount) ||
 		    rrn_find(rrl) != NULL);
 	}
 	mutex_exit(&rrl->rr_lock);
diff --git a/usr/src/uts/common/fs/zfs/sa.c b/usr/src/uts/common/fs/zfs/sa.c
index 3141e44c94..481312cfe9 100644
--- a/usr/src/uts/common/fs/zfs/sa.c
+++ b/usr/src/uts/common/fs/zfs/sa.c
@@ -1134,7 +1134,7 @@ sa_tear_down(objset_t *os)
 	while (layout = avl_destroy_nodes(&sa->sa_layout_hash_tree, &cookie)) {
 		sa_idx_tab_t *tab;
 		while (tab = list_head(&layout->lot_idx_tab)) {
-			ASSERT(refcount_count(&tab->sa_refcount));
+			ASSERT(zfs_refcount_count(&tab->sa_refcount));
 			sa_idx_tab_rele(os, tab);
 		}
 	}
@@ -1319,13 +1319,13 @@ sa_idx_tab_rele(objset_t *os, void *arg)
 		return;
 
 	mutex_enter(&sa->sa_lock);
-	if (refcount_remove(&idx_tab->sa_refcount, NULL) == 0) {
+	if (zfs_refcount_remove(&idx_tab->sa_refcount, NULL) == 0) {
 		list_remove(&idx_tab->sa_layout->lot_idx_tab, idx_tab);
 		if (idx_tab->sa_variable_lengths)
 			kmem_free(idx_tab->sa_variable_lengths,
 			    sizeof (uint16_t) *
 			    idx_tab->sa_layout->lot_var_sizes);
-		refcount_destroy(&idx_tab->sa_refcount);
+		zfs_refcount_destroy(&idx_tab->sa_refcount);
 		kmem_free(idx_tab->sa_idx_tab,
 		    sizeof (uint32_t) * sa->sa_num_attrs);
 		kmem_free(idx_tab, sizeof (sa_idx_tab_t));
@@ -1339,7 +1339,7 @@ sa_idx_tab_hold(objset_t *os, sa_idx_tab_t *idx_tab)
 	sa_os_t *sa = os->os_sa;
 
 	ASSERT(MUTEX_HELD(&sa->sa_lock));
-	(void) refcount_add(&idx_tab->sa_refcount, NULL);
+	(void) zfs_refcount_add(&idx_tab->sa_refcount, NULL);
 }
 
 void
@@ -1548,7 +1548,7 @@ sa_find_idx_tab(objset_t *os, dmu_object_type_t bonustype, sa_hdr_phys_t *hdr)
 	idx_tab->sa_idx_tab =
 	    kmem_zalloc(sizeof (uint32_t) * sa->sa_num_attrs, KM_SLEEP);
 	idx_tab->sa_layout = tb;
-	refcount_create(&idx_tab->sa_refcount);
+	zfs_refcount_create(&idx_tab->sa_refcount);
 	if (tb->lot_var_sizes)
 		idx_tab->sa_variable_lengths = kmem_alloc(sizeof (uint16_t) *
 		    tb->lot_var_sizes, KM_SLEEP);
diff --git a/usr/src/uts/common/fs/zfs/spa.c b/usr/src/uts/common/fs/zfs/spa.c
index 0a7f9c1ade..9b331b2098 100644
--- a/usr/src/uts/common/fs/zfs/spa.c
+++ b/usr/src/uts/common/fs/zfs/spa.c
@@ -2285,7 +2285,7 @@ spa_load(spa_t *spa, spa_load_state_t state, spa_import_type_t type)
 	 * and are making their way through the eviction process.
 	 */
 	spa_evicting_os_wait(spa);
-	spa->spa_minref = refcount_count(&spa->spa_refcount);
+	spa->spa_minref = zfs_refcount_count(&spa->spa_refcount);
 	if (error) {
 		if (error != EEXIST) {
 			spa->spa_loaded_ts.tv_sec = 0;
@@ -4860,7 +4860,7 @@ spa_create(const char *pool, nvlist_t *nvroot, nvlist_t *props,
 	 * and are making their way through the eviction process.
 	 */
 	spa_evicting_os_wait(spa);
-	spa->spa_minref = refcount_count(&spa->spa_refcount);
+	spa->spa_minref = zfs_refcount_count(&spa->spa_refcount);
 	spa->spa_load_state = SPA_LOAD_NONE;
 
 	mutex_exit(&spa_namespace_lock);
@@ -7662,7 +7662,8 @@ spa_sync(spa_t *spa, uint64_t txg)
 		 * allocations all happen from spa_sync().
 		 */
 		for (int i = 0; i < spa->spa_alloc_count; i++)
-			ASSERT0(refcount_count(&(mg->mg_alloc_queue_depth[i])));
+			ASSERT0(zfs_refcount_count(
+			    &(mg->mg_alloc_queue_depth[i])));
 		mg->mg_max_alloc_queue_depth = max_queue_depth;
 
 		for (int i = 0; i < spa->spa_alloc_count; i++) {
@@ -7673,7 +7674,7 @@ spa_sync(spa_t *spa, uint64_t txg)
 	}
 	metaslab_class_t *mc = spa_normal_class(spa);
 	for (int i = 0; i < spa->spa_alloc_count; i++) {
-		ASSERT0(refcount_count(&mc->mc_alloc_slots[i]));
+		ASSERT0(zfs_refcount_count(&mc->mc_alloc_slots[i]));
 		mc->mc_alloc_max_slots[i] = slots_per_allocator;
 	}
 	mc->mc_alloc_throttle_enabled = zio_dva_throttle_enabled;
diff --git a/usr/src/uts/common/fs/zfs/spa_misc.c b/usr/src/uts/common/fs/zfs/spa_misc.c
index 43965572bc..5acca63b01 100644
--- a/usr/src/uts/common/fs/zfs/spa_misc.c
+++ b/usr/src/uts/common/fs/zfs/spa_misc.c
@@ -79,7 +79,7 @@
  *	definition they must have an existing reference, and will never need
  *	to lookup a spa_t by name.
  *
- * spa_refcount (per-spa refcount_t protected by mutex)
+ * spa_refcount (per-spa zfs_refcount_t protected by mutex)
  *
  *	This reference count keep track of any active users of the spa_t.  The
  *	spa_t cannot be destroyed or freed while this is non-zero.  Internally,
@@ -400,7 +400,7 @@ spa_config_lock_init(spa_t *spa)
 		spa_config_lock_t *scl = &spa->spa_config_lock[i];
 		mutex_init(&scl->scl_lock, NULL, MUTEX_DEFAULT, NULL);
 		cv_init(&scl->scl_cv, NULL, CV_DEFAULT, NULL);
-		refcount_create_untracked(&scl->scl_count);
+		zfs_refcount_create_untracked(&scl->scl_count);
 		scl->scl_writer = NULL;
 		scl->scl_write_wanted = 0;
 	}
@@ -413,7 +413,7 @@ spa_config_lock_destroy(spa_t *spa)
 		spa_config_lock_t *scl = &spa->spa_config_lock[i];
 		mutex_destroy(&scl->scl_lock);
 		cv_destroy(&scl->scl_cv);
-		refcount_destroy(&scl->scl_count);
+		zfs_refcount_destroy(&scl->scl_count);
 		ASSERT(scl->scl_writer == NULL);
 		ASSERT(scl->scl_write_wanted == 0);
 	}
@@ -436,7 +436,7 @@ spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw)
 			}
 		} else {
 			ASSERT(scl->scl_writer != curthread);
-			if (!refcount_is_zero(&scl->scl_count)) {
+			if (!zfs_refcount_is_zero(&scl->scl_count)) {
 				mutex_exit(&scl->scl_lock);
 				spa_config_exit(spa, locks & ((1 << i) - 1),
 				    tag);
@@ -444,7 +444,7 @@ spa_config_tryenter(spa_t *spa, int locks, void *tag, krw_t rw)
 			}
 			scl->scl_writer = curthread;
 		}
-		(void) refcount_add(&scl->scl_count, tag);
+		(void) zfs_refcount_add(&scl->scl_count, tag);
 		mutex_exit(&scl->scl_lock);
 	}
 	return (1);
@@ -470,14 +470,14 @@ spa_config_enter(spa_t *spa, int locks, void *tag, krw_t rw)
 			}
 		} else {
 			ASSERT(scl->scl_writer != curthread);
-			while (!refcount_is_zero(&scl->scl_count)) {
+			while (!zfs_refcount_is_zero(&scl->scl_count)) {
 				scl->scl_write_wanted++;
 				cv_wait(&scl->scl_cv, &scl->scl_lock);
 				scl->scl_write_wanted--;
 			}
 			scl->scl_writer = curthread;
 		}
-		(void) refcount_add(&scl->scl_count, tag);
+		(void) zfs_refcount_add(&scl->scl_count, tag);
 		mutex_exit(&scl->scl_lock);
 	}
 	ASSERT3U(wlocks_held, <=, locks);
@@ -491,8 +491,8 @@ spa_config_exit(spa_t *spa, int locks, void *tag)
 		if (!(locks & (1 << i)))
 			continue;
 		mutex_enter(&scl->scl_lock);
-		ASSERT(!refcount_is_zero(&scl->scl_count));
-		if (refcount_remove(&scl->scl_count, tag) == 0) {
+		ASSERT(!zfs_refcount_is_zero(&scl->scl_count));
+		if (zfs_refcount_remove(&scl->scl_count, tag) == 0) {
 			ASSERT(scl->scl_writer == NULL ||
 			    scl->scl_writer == curthread);
 			scl->scl_writer = NULL;	/* OK in either case */
@@ -511,7 +511,8 @@ spa_config_held(spa_t *spa, int locks, krw_t rw)
 		spa_config_lock_t *scl = &spa->spa_config_lock[i];
 		if (!(locks & (1 << i)))
 			continue;
-		if ((rw == RW_READER && !refcount_is_zero(&scl->scl_count)) ||
+		if ((rw == RW_READER &&
+		    !zfs_refcount_is_zero(&scl->scl_count)) ||
 		    (rw == RW_WRITER && scl->scl_writer == curthread))
 			locks_held |= 1 << i;
 	}
@@ -645,7 +646,7 @@ spa_add(const char *name, nvlist_t *config, const char *altroot)
 	spa->spa_deadman_cycid = cyclic_add(&hdlr, &when);
 	mutex_exit(&cpu_lock);
 
-	refcount_create(&spa->spa_refcount);
+	zfs_refcount_create(&spa->spa_refcount);
 	spa_config_lock_init(spa);
 
 	avl_add(&spa_namespace_avl, spa);
@@ -733,7 +734,7 @@ spa_remove(spa_t *spa)
 
 	ASSERT(MUTEX_HELD(&spa_namespace_lock));
 	ASSERT(spa->spa_state == POOL_STATE_UNINITIALIZED);
-	ASSERT3U(refcount_count(&spa->spa_refcount), ==, 0);
+	ASSERT3U(zfs_refcount_count(&spa->spa_refcount), ==, 0);
 
 	nvlist_free(spa->spa_config_splitting);
 
@@ -773,7 +774,7 @@ spa_remove(spa_t *spa)
 	mutex_exit(&cpu_lock);
 	spa->spa_deadman_cycid = CYCLIC_NONE;
 
-	refcount_destroy(&spa->spa_refcount);
+	zfs_refcount_destroy(&spa->spa_refcount);
 
 	spa_config_lock_destroy(spa);
 
@@ -835,9 +836,9 @@ spa_next(spa_t *prev)
 void
 spa_open_ref(spa_t *spa, void *tag)
 {
-	ASSERT(refcount_count(&spa->spa_refcount) >= spa->spa_minref ||
+	ASSERT(zfs_refcount_count(&spa->spa_refcount) >= spa->spa_minref ||
 	    MUTEX_HELD(&spa_namespace_lock));
-	(void) refcount_add(&spa->spa_refcount, tag);
+	(void) zfs_refcount_add(&spa->spa_refcount, tag);
 }
 
 /*
@@ -847,9 +848,9 @@ spa_open_ref(spa_t *spa, void *tag)
 void
 spa_close(spa_t *spa, void *tag)
 {
-	ASSERT(refcount_count(&spa->spa_refcount) > spa->spa_minref ||
+	ASSERT(zfs_refcount_count(&spa->spa_refcount) > spa->spa_minref ||
 	    MUTEX_HELD(&spa_namespace_lock));
-	(void) refcount_remove(&spa->spa_refcount, tag);
+	(void) zfs_refcount_remove(&spa->spa_refcount, tag);
 }
 
 /*
@@ -863,7 +864,7 @@ spa_close(spa_t *spa, void *tag)
 void
 spa_async_close(spa_t *spa, void *tag)
 {
-	(void) refcount_remove(&spa->spa_refcount, tag);
+	(void) zfs_refcount_remove(&spa->spa_refcount, tag);
 }
 
 /*
@@ -876,7 +877,7 @@ spa_refcount_zero(spa_t *spa)
 {
 	ASSERT(MUTEX_HELD(&spa_namespace_lock));
 
-	return (refcount_count(&spa->spa_refcount) == spa->spa_minref);
+	return (zfs_refcount_count(&spa->spa_refcount) == spa->spa_minref);
 }
 
 /*
@@ -1965,7 +1966,7 @@ spa_init(int mode)
 	}
 #endif
 
-	refcount_init();
+	zfs_refcount_init();
 	unique_init();
 	range_tree_init();
 	metaslab_alloc_trace_init();
@@ -1994,7 +1995,7 @@ spa_fini(void)
 	metaslab_alloc_trace_fini();
 	range_tree_fini();
 	unique_fini();
-	refcount_fini();
+	zfs_refcount_fini();
 
 	avl_destroy(&spa_namespace_avl);
 	avl_destroy(&spa_spare_avl);
diff --git a/usr/src/uts/common/fs/zfs/sys/abd.h b/usr/src/uts/common/fs/zfs/sys/abd.h
index 134846a12f..952a0b68ba 100644
--- a/usr/src/uts/common/fs/zfs/sys/abd.h
+++ b/usr/src/uts/common/fs/zfs/sys/abd.h
@@ -39,7 +39,7 @@ typedef struct abd {
 	abd_flags_t	abd_flags;
 	uint_t		abd_size;	/* excludes scattered abd_offset */
 	struct abd	*abd_parent;
-	refcount_t	abd_children;
+	zfs_refcount_t	abd_children;
 	union {
 		struct abd_scatter {
 			uint_t	abd_offset;
diff --git a/usr/src/uts/common/fs/zfs/sys/dbuf.h b/usr/src/uts/common/fs/zfs/sys/dbuf.h
index ec966432f2..eedefa3615 100644
--- a/usr/src/uts/common/fs/zfs/sys/dbuf.h
+++ b/usr/src/uts/common/fs/zfs/sys/dbuf.h
@@ -219,7 +219,7 @@ typedef struct dmu_buf_impl {
 	 * If nonzero, the buffer can't be destroyed.
 	 * Protected by db_mtx.
 	 */
-	refcount_t db_holds;
+	zfs_refcount_t db_holds;
 
 	/* buffer holding our data */
 	arc_buf_t *db_buf;
diff --git a/usr/src/uts/common/fs/zfs/sys/dmu_tx.h b/usr/src/uts/common/fs/zfs/sys/dmu_tx.h
index 0442fbb664..0e7fcb0c86 100644
--- a/usr/src/uts/common/fs/zfs/sys/dmu_tx.h
+++ b/usr/src/uts/common/fs/zfs/sys/dmu_tx.h
@@ -97,8 +97,8 @@ typedef struct dmu_tx_hold {
 	dmu_tx_t *txh_tx;
 	list_node_t txh_node;
 	struct dnode *txh_dnode;
-	refcount_t txh_space_towrite;
-	refcount_t txh_memory_tohold;
+	zfs_refcount_t txh_space_towrite;
+	zfs_refcount_t txh_memory_tohold;
 	enum dmu_tx_hold_type txh_type;
 	uint64_t txh_arg1;
 	uint64_t txh_arg2;
diff --git a/usr/src/uts/common/fs/zfs/sys/dnode.h b/usr/src/uts/common/fs/zfs/sys/dnode.h
index 68872a8e9e..167ae789b6 100644
--- a/usr/src/uts/common/fs/zfs/sys/dnode.h
+++ b/usr/src/uts/common/fs/zfs/sys/dnode.h
@@ -301,8 +301,8 @@ struct dnode {
 	uint8_t *dn_dirtyctx_firstset;		/* dbg: contents meaningless */
 
 	/* protected by own devices */
-	refcount_t dn_tx_holds;
-	refcount_t dn_holds;
+	zfs_refcount_t dn_tx_holds;
+	zfs_refcount_t dn_holds;
 
 	kmutex_t dn_dbufs_mtx;
 	/*
diff --git a/usr/src/uts/common/fs/zfs/sys/dsl_dataset.h b/usr/src/uts/common/fs/zfs/sys/dsl_dataset.h
index 15a64a8326..064ff617fd 100644
--- a/usr/src/uts/common/fs/zfs/sys/dsl_dataset.h
+++ b/usr/src/uts/common/fs/zfs/sys/dsl_dataset.h
@@ -210,7 +210,7 @@ typedef struct dsl_dataset {
 	 * Owning counts as a long hold.  See the comments above
 	 * dsl_pool_hold() for details.
 	 */
-	refcount_t ds_longholds;
+	zfs_refcount_t ds_longholds;
 
 	/* no locking; only for making guesses */
 	uint64_t ds_trysnap_txg;
diff --git a/usr/src/uts/common/fs/zfs/sys/metaslab_impl.h b/usr/src/uts/common/fs/zfs/sys/metaslab_impl.h
index 0d2ce13fe9..a04264a23f 100644
--- a/usr/src/uts/common/fs/zfs/sys/metaslab_impl.h
+++ b/usr/src/uts/common/fs/zfs/sys/metaslab_impl.h
@@ -185,7 +185,7 @@ struct metaslab_class {
 	 * number of allocations allowed.
 	 */
 	uint64_t		*mc_alloc_max_slots;
-	refcount_t		*mc_alloc_slots;
+	zfs_refcount_t		*mc_alloc_slots;
 
 	uint64_t		mc_alloc_groups; /* # of allocatable groups */
 
@@ -257,7 +257,7 @@ struct metaslab_group {
 	 */
 	uint64_t		mg_max_alloc_queue_depth;
 	uint64_t		*mg_cur_max_alloc_queue_depth;
-	refcount_t		*mg_alloc_queue_depth;
+	zfs_refcount_t		*mg_alloc_queue_depth;
 	int			mg_allocators;
 	/*
 	 * A metalab group that can no longer allocate the minimum block
diff --git a/usr/src/uts/common/fs/zfs/sys/refcount.h b/usr/src/uts/common/fs/zfs/sys/refcount.h
index 17cb8174d4..0059a245ee 100644
--- a/usr/src/uts/common/fs/zfs/sys/refcount.h
+++ b/usr/src/uts/common/fs/zfs/sys/refcount.h
@@ -56,59 +56,62 @@ typedef struct refcount {
 	list_t rc_removed;
 	uint64_t rc_count;
 	uint64_t rc_removed_count;
-} refcount_t;
-
-/* Note: refcount_t must be initialized with refcount_create[_untracked]() */
-
-void refcount_create(refcount_t *rc);
-void refcount_create_untracked(refcount_t *rc);
-void refcount_create_tracked(refcount_t *rc);
-void refcount_destroy(refcount_t *rc);
-void refcount_destroy_many(refcount_t *rc, uint64_t number);
-int refcount_is_zero(refcount_t *rc);
-int64_t refcount_count(refcount_t *rc);
-int64_t refcount_add(refcount_t *rc, void *holder_tag);
-int64_t refcount_remove(refcount_t *rc, void *holder_tag);
-int64_t refcount_add_many(refcount_t *rc, uint64_t number, void *holder_tag);
-int64_t refcount_remove_many(refcount_t *rc, uint64_t number, void *holder_tag);
-void refcount_transfer(refcount_t *dst, refcount_t *src);
-void refcount_transfer_ownership(refcount_t *, void *, void *);
-boolean_t refcount_held(refcount_t *, void *);
-boolean_t refcount_not_held(refcount_t *, void *);
-
-void refcount_init(void);
-void refcount_fini(void);
+} zfs_refcount_t;
+
+/*
+ * Note: zfs_refcount_t must be initialized with
+ * refcount_create[_untracked]()
+ */
+
+void zfs_refcount_create(zfs_refcount_t *);
+void zfs_refcount_create_untracked(zfs_refcount_t *);
+void zfs_refcount_create_tracked(zfs_refcount_t *);
+void zfs_refcount_destroy(zfs_refcount_t *);
+void zfs_refcount_destroy_many(zfs_refcount_t *, uint64_t);
+int zfs_refcount_is_zero(zfs_refcount_t *);
+int64_t zfs_refcount_count(zfs_refcount_t *);
+int64_t zfs_refcount_add(zfs_refcount_t *, void *);
+int64_t zfs_refcount_remove(zfs_refcount_t *, void *);
+int64_t zfs_refcount_add_many(zfs_refcount_t *, uint64_t, void *);
+int64_t zfs_refcount_remove_many(zfs_refcount_t *, uint64_t, void *);
+void zfs_refcount_transfer(zfs_refcount_t *, zfs_refcount_t *);
+void zfs_refcount_transfer_ownership(zfs_refcount_t *, void *, void *);
+boolean_t zfs_refcount_held(zfs_refcount_t *, void *);
+boolean_t zfs_refcount_not_held(zfs_refcount_t *, void *);
+
+void zfs_refcount_init(void);
+void zfs_refcount_fini(void);
 
 #else	/* ZFS_DEBUG */
 
 typedef struct refcount {
 	uint64_t rc_count;
-} refcount_t;
-
-#define	refcount_create(rc) ((rc)->rc_count = 0)
-#define	refcount_create_untracked(rc) ((rc)->rc_count = 0)
-#define	refcount_create_tracked(rc) ((rc)->rc_count = 0)
-#define	refcount_destroy(rc) ((rc)->rc_count = 0)
-#define	refcount_destroy_many(rc, number) ((rc)->rc_count = 0)
-#define	refcount_is_zero(rc) ((rc)->rc_count == 0)
-#define	refcount_count(rc) ((rc)->rc_count)
-#define	refcount_add(rc, holder) atomic_inc_64_nv(&(rc)->rc_count)
-#define	refcount_remove(rc, holder) atomic_dec_64_nv(&(rc)->rc_count)
-#define	refcount_add_many(rc, number, holder) \
+} zfs_refcount_t;
+
+#define	zfs_refcount_create(rc) ((rc)->rc_count = 0)
+#define	zfs_refcount_create_untracked(rc) ((rc)->rc_count = 0)
+#define	zfs_refcount_create_tracked(rc) ((rc)->rc_count = 0)
+#define	zfs_refcount_destroy(rc) ((rc)->rc_count = 0)
+#define	zfs_refcount_destroy_many(rc, number) ((rc)->rc_count = 0)
+#define	zfs_refcount_is_zero(rc) ((rc)->rc_count == 0)
+#define	zfs_refcount_count(rc) ((rc)->rc_count)
+#define	zfs_refcount_add(rc, holder) atomic_inc_64_nv(&(rc)->rc_count)
+#define	zfs_refcount_remove(rc, holder) atomic_dec_64_nv(&(rc)->rc_count)
+#define	zfs_refcount_add_many(rc, number, holder) \
 	atomic_add_64_nv(&(rc)->rc_count, number)
-#define	refcount_remove_many(rc, number, holder) \
+#define	zfs_refcount_remove_many(rc, number, holder) \
 	atomic_add_64_nv(&(rc)->rc_count, -number)
-#define	refcount_transfer(dst, src) { \
+#define	zfs_refcount_transfer(dst, src) { \
 	uint64_t __tmp = (src)->rc_count; \
 	atomic_add_64(&(src)->rc_count, -__tmp); \
 	atomic_add_64(&(dst)->rc_count, __tmp); \
 }
-#define	refcount_transfer_ownership(rc, current_holder, new_holder)	(void)0
-#define	refcount_held(rc, holder)		((rc)->rc_count > 0)
-#define	refcount_not_held(rc, holder)		(B_TRUE)
+#define	zfs_refcount_transfer_ownership(rc, current_holder, new_holder)	(void)0
+#define	zfs_refcount_held(rc, holder)		((rc)->rc_count > 0)
+#define	zfs_refcount_not_held(rc, holder)		(B_TRUE)
 
-#define	refcount_init()
-#define	refcount_fini()
+#define	zfs_refcount_init()
+#define	zfs_refcount_fini()
 
 #endif	/* ZFS_DEBUG */
 
diff --git a/usr/src/uts/common/fs/zfs/sys/rrwlock.h b/usr/src/uts/common/fs/zfs/sys/rrwlock.h
index 947b51f872..4bcf115c6b 100644
--- a/usr/src/uts/common/fs/zfs/sys/rrwlock.h
+++ b/usr/src/uts/common/fs/zfs/sys/rrwlock.h
@@ -55,8 +55,8 @@ typedef struct rrwlock {
 	kmutex_t	rr_lock;
 	kcondvar_t	rr_cv;
 	kthread_t	*rr_writer;
-	refcount_t	rr_anon_rcount;
-	refcount_t	rr_linked_rcount;
+	zfs_refcount_t	rr_anon_rcount;
+	zfs_refcount_t	rr_linked_rcount;
 	boolean_t	rr_writer_wanted;
 	boolean_t	rr_track_all;
 } rrwlock_t;
diff --git a/usr/src/uts/common/fs/zfs/sys/sa_impl.h b/usr/src/uts/common/fs/zfs/sys/sa_impl.h
index 4bea074b54..50430125b2 100644
--- a/usr/src/uts/common/fs/zfs/sys/sa_impl.h
+++ b/usr/src/uts/common/fs/zfs/sys/sa_impl.h
@@ -110,7 +110,7 @@ typedef struct sa_idx_tab {
 	list_node_t	sa_next;
 	sa_lot_t	*sa_layout;
 	uint16_t	*sa_variable_lengths;
-	refcount_t	sa_refcount;
+	zfs_refcount_t	sa_refcount;
 	uint32_t	*sa_idx_tab;	/* array of offsets */
 } sa_idx_tab_t;
 
diff --git a/usr/src/uts/common/fs/zfs/sys/spa_impl.h b/usr/src/uts/common/fs/zfs/sys/spa_impl.h
index 9835947a1e..473237a90f 100644
--- a/usr/src/uts/common/fs/zfs/sys/spa_impl.h
+++ b/usr/src/uts/common/fs/zfs/sys/spa_impl.h
@@ -137,7 +137,7 @@ typedef struct spa_config_lock {
 	kthread_t	*scl_writer;
 	int		scl_write_wanted;
 	kcondvar_t	scl_cv;
-	refcount_t	scl_count;
+	zfs_refcount_t	scl_count;
 } spa_config_lock_t;
 
 typedef struct spa_config_dirent {
@@ -384,11 +384,12 @@ struct spa {
 	/*
 	 * spa_refcount & spa_config_lock must be the last elements
 	 * because refcount_t changes size based on compilation options.
+	 * because zfs_refcount_t changes size based on compilation options.
 	 * In order for the MDB module to function correctly, the other
 	 * fields must remain in the same location.
 	 */
 	spa_config_lock_t spa_config_lock[SCL_LOCKS]; /* config changes */
-	refcount_t	spa_refcount;		/* number of opens */
+	zfs_refcount_t	spa_refcount;		/* number of opens */
 };
 
 extern const char *spa_config_path;
diff --git a/usr/src/uts/common/fs/zfs/sys/zap.h b/usr/src/uts/common/fs/zfs/sys/zap.h
index 2c909ff53a..e7f5358140 100644
--- a/usr/src/uts/common/fs/zfs/sys/zap.h
+++ b/usr/src/uts/common/fs/zfs/sys/zap.h
@@ -228,7 +228,7 @@ int zap_lookup_norm_by_dnode(dnode_t *dn, const char *name,
     boolean_t *ncp);
 
 int zap_count_write_by_dnode(dnode_t *dn, const char *name,
-    int add, refcount_t *towrite, refcount_t *tooverwrite);
+    int add, zfs_refcount_t *towrite, zfs_refcount_t *tooverwrite);
 
 /*
  * Create an attribute with the given name and value.
diff --git a/usr/src/uts/common/fs/zfs/zio.c b/usr/src/uts/common/fs/zfs/zio.c
index e56498e32d..1e725f355a 100644
--- a/usr/src/uts/common/fs/zfs/zio.c
+++ b/usr/src/uts/common/fs/zfs/zio.c
@@ -2234,7 +2234,7 @@ zio_write_gang_block(zio_t *pio)
 		ASSERT(has_data);
 
 		flags |= METASLAB_ASYNC_ALLOC;
-		VERIFY(refcount_held(&mc->mc_alloc_slots[pio->io_allocator],
+		VERIFY(zfs_refcount_held(&mc->mc_alloc_slots[pio->io_allocator],
 		    pio));
 
 		/*
@@ -3682,8 +3682,8 @@ zio_done(zio_t *zio)
 		ASSERT(bp != NULL);
 		metaslab_group_alloc_verify(spa, zio->io_bp, zio,
 		    zio->io_allocator);
-		VERIFY(refcount_not_held(&mc->mc_alloc_slots[zio->io_allocator],
-		    zio));
+		VERIFY(zfs_refcount_not_held(
+		    &mc->mc_alloc_slots[zio->io_allocator], zio));
 	}
 
 	for (int c = 0; c < ZIO_CHILD_TYPES; c++)